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Message boards : Number crunching : Buliding a new PC

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Joined: 11 Jul 11
Posts: 1401
ID: 105020
Credit: 3,550,436,490
RAC: 1,154,878
Discovered 8 mega primesFound 5 primes in the 2020 Tour de PrimesFound 2 mega primes in the 2020 Tour de PrimesFound 4 primes in the 2021 Tour de PrimesFound 2 mega primes in the 2021 Tour de Primes321 LLR Sapphire: Earned 20,000,000 credits (20,020,701)Cullen LLR Sapphire: Earned 20,000,000 credits (20,174,451)ESP LLR Sapphire: Earned 20,000,000 credits (23,496,803)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,473,530)PPS LLR Emerald: Earned 50,000,000 credits (61,332,778)PSP LLR Emerald: Earned 50,000,000 credits (51,069,305)SoB LLR Emerald: Earned 50,000,000 credits (51,885,310)SR5 LLR Sapphire: Earned 20,000,000 credits (20,183,763)SGS LLR Sapphire: Earned 20,000,000 credits (20,482,069)TRP LLR Sapphire: Earned 20,000,000 credits (20,307,419)Woodall LLR Sapphire: Earned 20,000,000 credits (46,282,667)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,380,527)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,007,004)PPS Sieve Double Gold: Earned 500,000,000 credits (578,571,690)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)AP 26/27 Sapphire: Earned 20,000,000 credits (31,418,153)GFN Double Gold: Earned 500,000,000 credits (527,960,365)WW Double Ruby: Earned 2,000,000,000 credits (2,000,640,000)
Message 69708 - Posted: 7 Oct 2013 | 12:06:24 UTC

After much/some research I have this planned for my next number crunching pc:

1. $679 - Core i7 – 4930K 3.4 GHz LGA 2011 (6 core)
2. $445 - Gigabyte GTX-670 OC 4Gb graphics (I may buy a 2nd card later)
3. $250 - Gigabyte GA – X79 – UP4 mb
4. $245 - Coolermaster Vanguard gold 1000W psu
5. $169 - Kingston hyperx * 16Gb (2 * 8Gb) 1600 ram
6. $165 – Windows 7 professional
7. $129 - Coolermaster CM690 III CMS-693-KKN1 mid tower case
8. $22 - DVD RW
9. $18 - Kb / mouse

I already have a monitor (or I’ll use the tv), a 256Gb Vertex4 SSD and antivirus.

I am not planning to overclock the cpu or graphics card, but the options are there.

I am going with the LGA 2011 chipset (2nd gen - ivy bridge) rather than LGA 1150 (3rd gen - haswell) as its more stable and has less heat. This is what I have read. Also haswell is geared up for getting a lot done in a small package and minimal power. On a work station, getting it done well is more important.
I’m not going with LGA 1155 as I want a cpu with 6 cores.
I am concerned that the 600 and 700 series nvidia cards apparently aren’t as good at double precision cuda calculations – which is what is needed for prime grid? Primegrid peoples swear by the GTX 580 (I have a 570 in my main pc - its very good) which won’t be as easy to find.

Any thoughts?

Profile TylerProject donor
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Joined: 4 Dec 12
Posts: 1077
ID: 183129
Credit: 1,362,477,639
RAC: 192,477
Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,238,816)Cullen LLR Turquoise: Earned 5,000,000 credits (5,124,261)ESP LLR Jade: Earned 10,000,000 credits (10,003,255)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,883,977)PPS LLR Sapphire: Earned 20,000,000 credits (31,288,137)PSP LLR Sapphire: Earned 20,000,000 credits (37,386,303)SoB LLR Sapphire: Earned 20,000,000 credits (21,323,435)SR5 LLR Sapphire: Earned 20,000,000 credits (33,251,738)SGS LLR Turquoise: Earned 5,000,000 credits (5,000,408)TRP LLR Jade: Earned 10,000,000 credits (12,199,250)Woodall LLR Turquoise: Earned 5,000,000 credits (8,449,472)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,012,059)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (27,921,016)PPS Sieve Double Gold: Earned 500,000,000 credits (598,726,681)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,990,608)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,217,057)AP 26/27 Turquoise: Earned 5,000,000 credits (7,572,539)GFN Sapphire: Earned 20,000,000 credits (37,888,601)WW Jade: Earned 10,000,000 credits (13,440,000)PSA Double Silver: Earned 200,000,000 credits (420,586,383)
Message 69710 - Posted: 7 Oct 2013 | 12:29:36 UTC - in response to Message 69708.

After much/some research I have this planned for my next number crunching pc:

1. $679 - Core i7 – 4930K 3.4 GHz LGA 2011 (6 core)
2. $445 - Gigabyte GTX-670 OC 4Gb graphics (I may buy a 2nd card later)
3. $250 - Gigabyte GA – X79 – UP4 mb
4. $245 - Coolermaster Vanguard gold 1000W psu
5. $169 - Kingston hyperx * 16Gb (2 * 8Gb) 1600 ram
6. $165 – Windows 7 professional
7. $129 - Coolermaster CM690 III CMS-693-KKN1 mid tower case
8. $22 - DVD RW
9. $18 - Kb / mouse

I already have a monitor (or I’ll use the tv), a 256Gb Vertex4 SSD and antivirus.

I am not planning to overclock the cpu or graphics card, but the options are there.

I am going with the LGA 2011 chipset (2nd gen - ivy bridge) rather than LGA 1150 (3rd gen - haswell) as its more stable and has less heat. This is what I have read. Also haswell is geared up for getting a lot done in a small package and minimal power. On a work station, getting it done well is more important.
I’m not going with LGA 1155 as I want a cpu with 6 cores.
I am concerned that the 600 and 700 series nvidia cards apparently aren’t as good at double precision cuda calculations – which is what is needed for prime grid? Primegrid peoples swear by the GTX 580 (I have a 570 in my main pc - its very good) which won’t be as easy to find.

Any thoughts?

First off, those are some nice looking components.... and expensive. If it is for crunching, i'd get some 1866 or 2133 RAM, as that will be a nice speed boost to crunching LLR. As for finding a GTX 580, look on craigslist i see them there all the time. LGA 1150 is 4th gen, haswell, not 3rd gen. Third gen is the sandy bridges, the 3770k, 3570k, etc. Just dont use the default cpu cooler they send with it.. at least get the cooler master evo 212+ and some arctic silver. I did that and temps are 65C on full load on a 4.5GHz overclocked intel i5 2500k (stock 3.3). Good luck with this.
____________

275*2^3585539+1 is prime!!! (1079358 digits)

Proud member of Aggie the Pew

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 13698
ID: 53948
Credit: 318,897,986
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (20,817,335)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (4,470,298)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,902,645)GFN Emerald: Earned 50,000,000 credits (89,388,947)WW Emerald: Earned 50,000,000 credits (50,024,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 69711 - Posted: 7 Oct 2013 | 13:19:54 UTC - in response to Message 69708.


I am concerned that the 600 and 700 series nvidia cards apparently aren’t as good at double precision cuda calculations – which is what is needed for prime grid? Primegrid peoples swear by the GTX 580 (I have a 570 in my main pc - its very good) which won’t be as easy to find.

Any thoughts?


PrimeGrid has many apps, so whether you need good double precision performance depends on what you want to run. GFN and GFN-WR use double precision. PPS-sieve does not.

If you want to run one of the GFN apps, you might want to consider a high-end ATI/AMD GPU instead. With GeneferOCL, people are seeing performance close to the GTX Titan with the HD7970, which costs half as much. ATI cards do have much better double precision performance.

Also, it seems that with the GTX 600 series and later GPUs, you get better performance using the GeneferOCL app instead of GeneferCUDA, although I don't have enough data to say that this is always true. If you get an Nvidia GPU you should test both apps and use whichever is fastest.
____________
My lucky number is 75898524288+1

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 13698
ID: 53948
Credit: 318,897,986
RAC: 270,835
The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (20,817,335)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (4,470,298)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,902,645)GFN Emerald: Earned 50,000,000 credits (89,388,947)WW Emerald: Earned 50,000,000 credits (50,024,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 69713 - Posted: 7 Oct 2013 | 13:41:57 UTC

Also, with regards to GPU speeds, you can click on the "Fastest GPUs" link over on the left side menu.
____________
My lucky number is 75898524288+1

Profile Tarmo IlvesProject donor
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Joined: 16 Oct 10
Posts: 562
ID: 70245
Credit: 537,192,869
RAC: 0
321 LLR Amethyst: Earned 1,000,000 credits (1,016,725)Cullen LLR Gold: Earned 500,000 credits (541,582)ESP LLR Gold: Earned 500,000 credits (522,586)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (114,178)PPS LLR Amethyst: Earned 1,000,000 credits (1,057,214)PSP LLR Gold: Earned 500,000 credits (552,958)SoB LLR Amethyst: Earned 1,000,000 credits (1,056,364)SR5 LLR Gold: Earned 500,000 credits (592,676)SGS LLR Amethyst: Earned 1,000,000 credits (1,022,263)TRP LLR Gold: Earned 500,000 credits (567,024)Woodall LLR Gold: Earned 500,000 credits (545,306)321 Sieve (suspended) Bronze: Earned 10,000 credits (12,661)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (43,606,554)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,076,992)PPS Sieve Double Silver: Earned 200,000,000 credits (251,563,692)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,633,390)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,012,727)AP 26/27 Gold: Earned 500,000 credits (594,321)GFN Jade: Earned 10,000,000 credits (18,010,659)PSA Double Silver: Earned 200,000,000 credits (204,092,997)
Message 69747 - Posted: 8 Oct 2013 | 11:49:53 UTC - in response to Message 69710.

After much/some research I have this planned for my next number crunching pc:

1. $679 - Core i7 – 4930K 3.4 GHz LGA 2011 (6 core)
2. $445 - Gigabyte GTX-670 OC 4Gb graphics (I may buy a 2nd card later)
3. $250 - Gigabyte GA – X79 – UP4 mb
4. $245 - Coolermaster Vanguard gold 1000W psu
5. $169 - Kingston hyperx * 16Gb (2 * 8Gb) 1600 ram
6. $165 – Windows 7 professional
7. $129 - Coolermaster CM690 III CMS-693-KKN1 mid tower case
8. $22 - DVD RW
9. $18 - Kb / mouse

I already have a monitor (or I’ll use the tv), a 256Gb Vertex4 SSD and antivirus.

I am not planning to overclock the cpu or graphics card, but the options are there.

I am going with the LGA 2011 chipset (2nd gen - ivy bridge) rather than LGA 1150 (3rd gen - haswell) as its more stable and has less heat. This is what I have read. Also haswell is geared up for getting a lot done in a small package and minimal power. On a work station, getting it done well is more important.
I’m not going with LGA 1155 as I want a cpu with 6 cores.
I am concerned that the 600 and 700 series nvidia cards apparently aren’t as good at double precision cuda calculations – which is what is needed for prime grid? Primegrid peoples swear by the GTX 580 (I have a 570 in my main pc - its very good) which won’t be as easy to find.

Any thoughts?

First off, those are some nice looking components.... and expensive. If it is for crunching, i'd get some 1866 or 2133 RAM, as that will be a nice speed boost to crunching LLR. As for finding a GTX 580, look on craigslist i see them there all the time. LGA 1150 is 4th gen, haswell, not 3rd gen. Third gen is the sandy bridges, the 3770k, 3570k, etc. Just dont use the default cpu cooler they send with it.. at least get the cooler master evo 212+ and some arctic silver. I did that and temps are 65C on full load on a 4.5GHz overclocked intel i5 2500k (stock 3.3). Good luck with this.

3770k is Ivy Bridge!

____________

Profile TylerProject donor
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Joined: 4 Dec 12
Posts: 1077
ID: 183129
Credit: 1,362,477,639
RAC: 192,477
Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,238,816)Cullen LLR Turquoise: Earned 5,000,000 credits (5,124,261)ESP LLR Jade: Earned 10,000,000 credits (10,003,255)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,883,977)PPS LLR Sapphire: Earned 20,000,000 credits (31,288,137)PSP LLR Sapphire: Earned 20,000,000 credits (37,386,303)SoB LLR Sapphire: Earned 20,000,000 credits (21,323,435)SR5 LLR Sapphire: Earned 20,000,000 credits (33,251,738)SGS LLR Turquoise: Earned 5,000,000 credits (5,000,408)TRP LLR Jade: Earned 10,000,000 credits (12,199,250)Woodall LLR Turquoise: Earned 5,000,000 credits (8,449,472)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,012,059)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (27,921,016)PPS Sieve Double Gold: Earned 500,000,000 credits (598,726,681)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,990,608)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,217,057)AP 26/27 Turquoise: Earned 5,000,000 credits (7,572,539)GFN Sapphire: Earned 20,000,000 credits (37,888,601)WW Jade: Earned 10,000,000 credits (13,440,000)PSA Double Silver: Earned 200,000,000 credits (420,586,383)
Message 69748 - Posted: 8 Oct 2013 | 12:23:02 UTC - in response to Message 69747.

After much/some research I have this planned for my next number crunching pc:

1. $679 - Core i7 – 4930K 3.4 GHz LGA 2011 (6 core)
2. $445 - Gigabyte GTX-670 OC 4Gb graphics (I may buy a 2nd card later)
3. $250 - Gigabyte GA – X79 – UP4 mb
4. $245 - Coolermaster Vanguard gold 1000W psu
5. $169 - Kingston hyperx * 16Gb (2 * 8Gb) 1600 ram
6. $165 – Windows 7 professional
7. $129 - Coolermaster CM690 III CMS-693-KKN1 mid tower case
8. $22 - DVD RW
9. $18 - Kb / mouse

I already have a monitor (or I’ll use the tv), a 256Gb Vertex4 SSD and antivirus.

I am not planning to overclock the cpu or graphics card, but the options are there.

I am going with the LGA 2011 chipset (2nd gen - ivy bridge) rather than LGA 1150 (3rd gen - haswell) as its more stable and has less heat. This is what I have read. Also haswell is geared up for getting a lot done in a small package and minimal power. On a work station, getting it done well is more important.
I’m not going with LGA 1155 as I want a cpu with 6 cores.
I am concerned that the 600 and 700 series nvidia cards apparently aren’t as good at double precision cuda calculations – which is what is needed for prime grid? Primegrid peoples swear by the GTX 580 (I have a 570 in my main pc - its very good) which won’t be as easy to find.

Any thoughts?

First off, those are some nice looking components.... and expensive. If it is for crunching, i'd get some 1866 or 2133 RAM, as that will be a nice speed boost to crunching LLR. As for finding a GTX 580, look on craigslist i see them there all the time. LGA 1150 is 4th gen, haswell, not 3rd gen. Third gen is the sandy bridges, the 3770k, 3570k, etc. Just dont use the default cpu cooler they send with it.. at least get the cooler master evo 212+ and some arctic silver. I did that and temps are 65C on full load on a 4.5GHz overclocked intel i5 2500k (stock 3.3). Good luck with this.

3770k is Ivy Bridge!

Derp. Thats what I meant... EIther that or i meant 2nd gen. but either way, 3rd gen isnt haswell. :P
____________

275*2^3585539+1 is prime!!! (1079358 digits)

Proud member of Aggie the Pew

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Joined: 15 Sep 12
Posts: 18
ID: 172579
Credit: 2,712,596,735
RAC: 2,098,709
321 LLR Bronze: Earned 10,000 credits (73,438)PSP LLR Turquoise: Earned 5,000,000 credits (8,546,573)SoB LLR Double Silver: Earned 200,000,000 credits (293,012,829)SR5 LLR Ruby: Earned 2,000,000 credits (3,685,924)SGS LLR Silver: Earned 100,000 credits (102,618)TRP LLR Jade: Earned 10,000,000 credits (19,352,438)PPS Sieve Gold: Earned 500,000 credits (788,814)AP 26/27 Silver: Earned 100,000 credits (206,193)GFN Double Ruby: Earned 2,000,000,000 credits (2,386,821,067)
Message 69749 - Posted: 8 Oct 2013 | 12:23:54 UTC

CPU tasks(LLR) requires much memory bandwidth.
If you use the LGA 2011 platform, you should a quad-channel momory.

Not 2 * 8Gb but 4 * 4Gb.

Profile mikey
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Joined: 17 Mar 09
Posts: 1311
ID: 37043
Credit: 533,740,635
RAC: 179
Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,038,739)Cullen LLR Ruby: Earned 2,000,000 credits (2,074,615)ESP LLR Ruby: Earned 2,000,000 credits (2,243,517)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,142,353)PPS LLR Turquoise: Earned 5,000,000 credits (7,292,925)PSP LLR Ruby: Earned 2,000,000 credits (2,232,103)SoB LLR Ruby: Earned 2,000,000 credits (2,934,612)SR5 LLR Ruby: Earned 2,000,000 credits (2,057,332)SGS LLR Turquoise: Earned 5,000,000 credits (5,231,028)TRP LLR Ruby: Earned 2,000,000 credits (2,420,063)Woodall LLR Ruby: Earned 2,000,000 credits (2,014,811)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (23,770,672)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (944,431)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,813,253)PPS Sieve Double Silver: Earned 200,000,000 credits (342,048,709)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,446,797)AP 26/27 Sapphire: Earned 20,000,000 credits (33,140,471)GFN Sapphire: Earned 20,000,000 credits (49,651,200)WW Turquoise: Earned 5,000,000 credits (7,792,000)PSA Sapphire: Earned 20,000,000 credits (20,457,430)
Message 69750 - Posted: 8 Oct 2013 | 12:37:47 UTC - in response to Message 69708.

After much/some research I have this planned for my next number crunching pc:

1. $679 - Core i7 – 4930K 3.4 GHz LGA 2011 (6 core)
2. $445 - Gigabyte GTX-670 OC 4Gb graphics (I may buy a 2nd card later)
3. $250 - Gigabyte GA – X79 – UP4 mb
4. $245 - Coolermaster Vanguard gold 1000W psu
5. $169 - Kingston hyperx * 16Gb (2 * 8Gb) 1600 ram
6. $165 – Windows 7 professional
7. $129 - Coolermaster CM690 III CMS-693-KKN1 mid tower case
8. $22 - DVD RW
9. $18 - Kb / mouse

I already have a monitor (or I’ll use the tv), a 256Gb Vertex4 SSD and antivirus.

I am not planning to overclock the cpu or graphics card, but the options are there.

I am going with the LGA 2011 chipset (2nd gen - ivy bridge) rather than LGA 1150 (3rd gen - haswell) as its more stable and has less heat. This is what I have read. Also haswell is geared up for getting a lot done in a small package and minimal power. On a work station, getting it done well is more important.
I’m not going with LGA 1155 as I want a cpu with 6 cores.
I am concerned that the 600 and 700 series nvidia cards apparently aren’t as good at double precision cuda calculations – which is what is needed for prime grid? Primegrid peoples swear by the GTX 580 (I have a 570 in my main pc - its very good) which won’t be as easy to find.

Any thoughts?


If this is JUST for number crunching that is ALOT of money!! I would go for an AMD 6 core 6300 for 500 bucks less for one thing. That then reduces your mb costs, your power supply at 1000 watts is overkill, you can get away with a 850 or even an 750 with those specs. The case too is overkill for a cruncher, they have cases on sale for 30 bucks that wil lwork just fine. The SSD drive while fast won't help much with the actual crunching, in fact if you don't have a good backup system in place an SSD drive is NOT your best choice. When an SSD drive fails it is usually the controller built into the drive, meaning you cannot access the data and you have a doorstop!

Overall it sounds like you are building a gaming machine to show off and not just a cruncher to stick on a shelf. If that is the case then what you are building will work just fine, but I would upgrade the gpu at some point. Amazon is selling 7970 cards for @270 bucks right now! One more thing MAKE SURE you get the 64bit version of Windows, the 32bit versions are not as flexible for crunching. They are making more and more 64bit apps and if you are stuck at 32bits you cannot help. You can crunch the 32bit apps with a 64bit machine, but you cannot crunch the 64bit apps with a 32bit machine.

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
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Credit: 318,897,986
RAC: 270,835
The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (20,817,335)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (4,470,298)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,902,645)GFN Emerald: Earned 50,000,000 credits (89,388,947)WW Emerald: Earned 50,000,000 credits (50,024,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 69756 - Posted: 8 Oct 2013 | 14:33:02 UTC - in response to Message 69750.

If this is JUST for number crunching that is ALOT of money!! I would go for an AMD 6 core 6300 for 500 bucks less for one thing.


Has something changed whereby AVX now runs on AMD? If not, there's still a huge speed advantage when using Intel IB+ CPUs compared to any earlier Intel and all AMD CPUs.
____________
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Credit: 1,362,477,639
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Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,238,816)Cullen LLR Turquoise: Earned 5,000,000 credits (5,124,261)ESP LLR Jade: Earned 10,000,000 credits (10,003,255)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,883,977)PPS LLR Sapphire: Earned 20,000,000 credits (31,288,137)PSP LLR Sapphire: Earned 20,000,000 credits (37,386,303)SoB LLR Sapphire: Earned 20,000,000 credits (21,323,435)SR5 LLR Sapphire: Earned 20,000,000 credits (33,251,738)SGS LLR Turquoise: Earned 5,000,000 credits (5,000,408)TRP LLR Jade: Earned 10,000,000 credits (12,199,250)Woodall LLR Turquoise: Earned 5,000,000 credits (8,449,472)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,012,059)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (27,921,016)PPS Sieve Double Gold: Earned 500,000,000 credits (598,726,681)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,990,608)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,217,057)AP 26/27 Turquoise: Earned 5,000,000 credits (7,572,539)GFN Sapphire: Earned 20,000,000 credits (37,888,601)WW Jade: Earned 10,000,000 credits (13,440,000)PSA Double Silver: Earned 200,000,000 credits (420,586,383)
Message 69758 - Posted: 8 Oct 2013 | 15:19:16 UTC - in response to Message 69756.

If this is JUST for number crunching that is ALOT of money!! I would go for an AMD 6 core 6300 for 500 bucks less for one thing.


Has something changed whereby AVX now runs on AMD? If not, there's still a huge speed advantage when using Intel IB+ CPUs compared to any earlier Intel and all AMD CPUs.

I believe you mean SB+?
____________

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Joined: 21 Jan 10
Posts: 13698
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Credit: 318,897,986
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (20,817,335)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (4,470,298)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,902,645)GFN Emerald: Earned 50,000,000 credits (89,388,947)WW Emerald: Earned 50,000,000 credits (50,024,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 69759 - Posted: 8 Oct 2013 | 15:34:03 UTC - in response to Message 69758.

If this is JUST for number crunching that is ALOT of money!! I would go for an AMD 6 core 6300 for 500 bucks less for one thing.


Has something changed whereby AVX now runs on AMD? If not, there's still a huge speed advantage when using Intel IB+ CPUs compared to any earlier Intel and all AMD CPUs.

I believe you mean SB+?


Yes, SB+, sorry.
____________
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Discovered 8 mega primesFound 5 primes in the 2020 Tour de PrimesFound 2 mega primes in the 2020 Tour de PrimesFound 4 primes in the 2021 Tour de PrimesFound 2 mega primes in the 2021 Tour de Primes321 LLR Sapphire: Earned 20,000,000 credits (20,020,701)Cullen LLR Sapphire: Earned 20,000,000 credits (20,174,451)ESP LLR Sapphire: Earned 20,000,000 credits (23,496,803)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,473,530)PPS LLR Emerald: Earned 50,000,000 credits (61,332,778)PSP LLR Emerald: Earned 50,000,000 credits (51,069,305)SoB LLR Emerald: Earned 50,000,000 credits (51,885,310)SR5 LLR Sapphire: Earned 20,000,000 credits (20,183,763)SGS LLR Sapphire: Earned 20,000,000 credits (20,482,069)TRP LLR Sapphire: Earned 20,000,000 credits (20,307,419)Woodall LLR Sapphire: Earned 20,000,000 credits (46,282,667)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,380,527)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,007,004)PPS Sieve Double Gold: Earned 500,000,000 credits (578,571,690)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)AP 26/27 Sapphire: Earned 20,000,000 credits (31,418,153)GFN Double Gold: Earned 500,000,000 credits (527,960,365)WW Double Ruby: Earned 2,000,000,000 credits (2,000,640,000)
Message 69760 - Posted: 8 Oct 2013 | 16:16:46 UTC - in response to Message 69750.

Hi Mikey,
You are right its way too much to spend on a cruncher but it would also be for gaming. (And sorry to everyone for getting my generation numbers wrong. I knew Haswell is 4th gen, so not sure what happened there) I had a list of components that was half that price. It included an i5-3570K and a GTX760 (2Gb). But I'll look into the 7970. I was definitely planning to get the 64 bit version of Windows. I bought the SSD a while back for my laptop and couldn't get it to work, so I was trying to save $70 by using it on this build (a bit silly considering the dream list of components)
Cheers,
Nick

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Credit: 3,550,436,490
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Discovered 8 mega primesFound 5 primes in the 2020 Tour de PrimesFound 2 mega primes in the 2020 Tour de PrimesFound 4 primes in the 2021 Tour de PrimesFound 2 mega primes in the 2021 Tour de Primes321 LLR Sapphire: Earned 20,000,000 credits (20,020,701)Cullen LLR Sapphire: Earned 20,000,000 credits (20,174,451)ESP LLR Sapphire: Earned 20,000,000 credits (23,496,803)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,473,530)PPS LLR Emerald: Earned 50,000,000 credits (61,332,778)PSP LLR Emerald: Earned 50,000,000 credits (51,069,305)SoB LLR Emerald: Earned 50,000,000 credits (51,885,310)SR5 LLR Sapphire: Earned 20,000,000 credits (20,183,763)SGS LLR Sapphire: Earned 20,000,000 credits (20,482,069)TRP LLR Sapphire: Earned 20,000,000 credits (20,307,419)Woodall LLR Sapphire: Earned 20,000,000 credits (46,282,667)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,380,527)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,007,004)PPS Sieve Double Gold: Earned 500,000,000 credits (578,571,690)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)AP 26/27 Sapphire: Earned 20,000,000 credits (31,418,153)GFN Double Gold: Earned 500,000,000 credits (527,960,365)WW Double Ruby: Earned 2,000,000,000 credits (2,000,640,000)
Message 69761 - Posted: 8 Oct 2013 | 16:21:14 UTC - in response to Message 69749.

Thanks for the advice Shinozk - at the back of my mind I was thinking I'd eventually upgrade to 32 Gb - but I think the last time I upgraded memory it was with a Pentium 120 or K62. So I am unlikely to add more later.

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Credit: 3,550,436,490
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Discovered 8 mega primesFound 5 primes in the 2020 Tour de PrimesFound 2 mega primes in the 2020 Tour de PrimesFound 4 primes in the 2021 Tour de PrimesFound 2 mega primes in the 2021 Tour de Primes321 LLR Sapphire: Earned 20,000,000 credits (20,020,701)Cullen LLR Sapphire: Earned 20,000,000 credits (20,174,451)ESP LLR Sapphire: Earned 20,000,000 credits (23,496,803)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,473,530)PPS LLR Emerald: Earned 50,000,000 credits (61,332,778)PSP LLR Emerald: Earned 50,000,000 credits (51,069,305)SoB LLR Emerald: Earned 50,000,000 credits (51,885,310)SR5 LLR Sapphire: Earned 20,000,000 credits (20,183,763)SGS LLR Sapphire: Earned 20,000,000 credits (20,482,069)TRP LLR Sapphire: Earned 20,000,000 credits (20,307,419)Woodall LLR Sapphire: Earned 20,000,000 credits (46,282,667)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,380,527)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,007,004)PPS Sieve Double Gold: Earned 500,000,000 credits (578,571,690)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)AP 26/27 Sapphire: Earned 20,000,000 credits (31,418,153)GFN Double Gold: Earned 500,000,000 credits (527,960,365)WW Double Ruby: Earned 2,000,000,000 credits (2,000,640,000)
Message 69762 - Posted: 8 Oct 2013 | 16:26:33 UTC - in response to Message 69711.

Thanks for the advice - I'll look into the 7970. For some reason I was hooked on the idea of 6 cores. The list of components becomes much more sensible if I get an i5 3570K. Cheers, Nick

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Credit: 3,550,436,490
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Discovered 8 mega primesFound 5 primes in the 2020 Tour de PrimesFound 2 mega primes in the 2020 Tour de PrimesFound 4 primes in the 2021 Tour de PrimesFound 2 mega primes in the 2021 Tour de Primes321 LLR Sapphire: Earned 20,000,000 credits (20,020,701)Cullen LLR Sapphire: Earned 20,000,000 credits (20,174,451)ESP LLR Sapphire: Earned 20,000,000 credits (23,496,803)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,473,530)PPS LLR Emerald: Earned 50,000,000 credits (61,332,778)PSP LLR Emerald: Earned 50,000,000 credits (51,069,305)SoB LLR Emerald: Earned 50,000,000 credits (51,885,310)SR5 LLR Sapphire: Earned 20,000,000 credits (20,183,763)SGS LLR Sapphire: Earned 20,000,000 credits (20,482,069)TRP LLR Sapphire: Earned 20,000,000 credits (20,307,419)Woodall LLR Sapphire: Earned 20,000,000 credits (46,282,667)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,380,527)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,007,004)PPS Sieve Double Gold: Earned 500,000,000 credits (578,571,690)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)AP 26/27 Sapphire: Earned 20,000,000 credits (31,418,153)GFN Double Gold: Earned 500,000,000 credits (527,960,365)WW Double Ruby: Earned 2,000,000,000 credits (2,000,640,000)
Message 69763 - Posted: 8 Oct 2013 | 16:40:24 UTC - in response to Message 69710.

Hi 1998golfer, I have these specs for the processor I'd chosen: DDR3-1066/1333/1600. Or can I use faster ram anyway? Great advice on the cpu cooler. Cheers, Nick

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Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (3,002,800)ESP LLR Ruby: Earned 2,000,000 credits (2,006,207)PPS LLR Turquoise: Earned 5,000,000 credits (6,001,018)PSP LLR Ruby: Earned 2,000,000 credits (3,026,236)SoB LLR Ruby: Earned 2,000,000 credits (2,015,539)SR5 LLR Ruby: Earned 2,000,000 credits (2,000,481)SGS LLR Ruby: Earned 2,000,000 credits (2,000,014)TRP LLR Ruby: Earned 2,000,000 credits (3,000,865)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (2,000,357)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,000,096)PPS Sieve Emerald: Earned 50,000,000 credits (50,000,422)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,000,500)AP 26/27 Emerald: Earned 50,000,000 credits (50,003,824)GFN Emerald: Earned 50,000,000 credits (50,000,235)PSA Emerald: Earned 50,000,000 credits (50,000,198)
Message 69767 - Posted: 8 Oct 2013 | 17:10:08 UTC

DDR3-2133/2400 best choice for large LLR projects.

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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (20,817,335)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (4,470,298)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,902,645)GFN Emerald: Earned 50,000,000 credits (89,388,947)WW Emerald: Earned 50,000,000 credits (50,024,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 69771 - Posted: 8 Oct 2013 | 18:25:30 UTC - in response to Message 69767.

DDR3-2133/2400 best choice for large LLR projects.


Chip is absolutely correct. There's been a lot of discussion over on the Mersenne forums about memory bandwidth, and it's absolutely critical that you have the fastest memory available. That's the bottleneck.
____________
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Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,038,739)Cullen LLR Ruby: Earned 2,000,000 credits (2,074,615)ESP LLR Ruby: Earned 2,000,000 credits (2,243,517)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,142,353)PPS LLR Turquoise: Earned 5,000,000 credits (7,292,925)PSP LLR Ruby: Earned 2,000,000 credits (2,232,103)SoB LLR Ruby: Earned 2,000,000 credits (2,934,612)SR5 LLR Ruby: Earned 2,000,000 credits (2,057,332)SGS LLR Turquoise: Earned 5,000,000 credits (5,231,028)TRP LLR Ruby: Earned 2,000,000 credits (2,420,063)Woodall LLR Ruby: Earned 2,000,000 credits (2,014,811)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (23,770,672)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (944,431)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,813,253)PPS Sieve Double Silver: Earned 200,000,000 credits (342,048,709)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,446,797)AP 26/27 Sapphire: Earned 20,000,000 credits (33,140,471)GFN Sapphire: Earned 20,000,000 credits (49,651,200)WW Turquoise: Earned 5,000,000 credits (7,792,000)PSA Sapphire: Earned 20,000,000 credits (20,457,430)
Message 69788 - Posted: 9 Oct 2013 | 11:35:29 UTC - in response to Message 69760.

Hi Mikey,
You are right its way too much to spend on a cruncher but it would also be for gaming. (And sorry to everyone for getting my generation numbers wrong. I knew Haswell is 4th gen, so not sure what happened there) I had a list of components that was half that price. It included an i5-3570K and a GTX760 (2Gb). But I'll look into the 7970. I was definitely planning to get the 64 bit version of Windows. I bought the SSD a while back for my laptop and couldn't get it to work, so I was trying to save $70 by using it on this build (a bit silly considering the dream list of components)
Cheers,
Nick


I think the SSD will work just fine, just make sure you DO backups regularly!! If you want free I can give you the name of the one I use, but the free version does NOT do incremental backups, only full images of the data on the drive. Incremental means only backing up the stuff that has changed since the last backup. I personally do monthly backups to a drive in one of my machines, and yes it does do them automatically.

As for the 3gb 7970 I think you will be happier with it then the 2gb 670.

As for the rest overall yes Intel IS faster, but if JUST a cruncher then you could build two AMD machines for the cost of one fancy Intel machine. I can build AMD 6 core machines for less then $250 including cpu, mb and memory, the rest I reuse from the existing machine. Gaming is about showing off though, and YES the fancy case, the fancy specs etc DO make a difference. Crunching is just crunching and involves putting a box on the shelf and just letting it do it's thing day after day after day.

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321 LLR Amethyst: Earned 1,000,000 credits (1,065,278)Cullen LLR Gold: Earned 500,000 credits (571,506)ESP LLR Silver: Earned 100,000 credits (185,054)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (460,220)PPS LLR Amethyst: Earned 1,000,000 credits (1,154,429)PSP LLR Ruby: Earned 2,000,000 credits (2,190,174)SoB LLR Ruby: Earned 2,000,000 credits (2,201,813)SR5 LLR Silver: Earned 100,000 credits (292,115)SGS LLR Gold: Earned 500,000 credits (748,792)TRP LLR Gold: Earned 500,000 credits (675,047)Woodall LLR Amethyst: Earned 1,000,000 credits (1,210,464)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,016,453)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (25,001,013)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (16,858,065)PPS Sieve Emerald: Earned 50,000,000 credits (65,684,329)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (21,004,347)TRP Sieve (suspended) Jade: Earned 10,000,000 credits (10,080,762)AP 26/27 Turquoise: Earned 5,000,000 credits (5,177,651)GFN Jade: Earned 10,000,000 credits (10,325,889)PSA Double Silver: Earned 200,000,000 credits (267,901,478)
Message 69839 - Posted: 10 Oct 2013 | 14:00:09 UTC - in response to Message 69771.
Last modified: 10 Oct 2013 | 14:00:46 UTC

DDR3-2133/2400 best choice for large LLR projects.


Chip is absolutely correct. There's been a lot of discussion over on the Mersenne forums about memory bandwidth, and it's absolutely critical that you have the fastest memory available. That's the bottleneck.


Good to know! Can you give a specific link for that?

PS. It would be nice to have thread like: "best computer parts for primegrid" with recommendation of best part for llr, sieve, gfn subprojects. A mini FAQ. :)

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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (20,817,335)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (4,470,298)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,902,645)GFN Emerald: Earned 50,000,000 credits (89,388,947)WW Emerald: Earned 50,000,000 credits (50,024,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 69840 - Posted: 10 Oct 2013 | 14:22:09 UTC - in response to Message 69839.

DDR3-2133/2400 best choice for large LLR projects.


Chip is absolutely correct. There's been a lot of discussion over on the Mersenne forums about memory bandwidth, and it's absolutely critical that you have the fastest memory available. That's the bottleneck.


Good to know! Can you give a specific link for that?

PS. It would be nice to have thread like: "best computer parts for primegrid" with recommendation of best part for llr, sieve, gfn subprojects. A mini FAQ. :)


http://www.mersenneforum.org/showthread.php?t=17982

The thread is mainly concerned about P95 and the Haswell CPUs, but their discussion about memory bandwidth applies to IB/SB as well. Haswell optimized code is even more limited by memory bandwidth than AVX code, but the problem is still pretty severe with AVX (or older) CPUs. That's why we see LLR speeds drop off when running multiple cores on the CPU. If crunching LLR (or GFN on a CPU) is what you want, try to get the fastest RAM possible because that's going to be the bottleneck.

Also note that the more cores that are running LLR, the more you're going to be affected by memory bandwidth. You might want to consider that when deciding whether to spend more $$$ for a hex core vs. a quad core CPU.

If it were me, given what I've read as well as my own first hand knowledge, in order to optimize for LLR I'd probably get a quad core Ivy Bridge i7 (with HT off) with 2400 speed memory. Take my advice with a grain of salt, however -- optimization is very complex and depends on many small details, and the results are not always what you expect. (I'm not addressing the dual vs. quad channel issue because I'm not sure about the details, but it sounds very reasonable.)

I personally wouldn't get Haswell right now because it's still unclear whether it's going to offer a significant advantage, especially in light of the memory constraints.
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321 LLR Amethyst: Earned 1,000,000 credits (1,065,278)Cullen LLR Gold: Earned 500,000 credits (571,506)ESP LLR Silver: Earned 100,000 credits (185,054)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (460,220)PPS LLR Amethyst: Earned 1,000,000 credits (1,154,429)PSP LLR Ruby: Earned 2,000,000 credits (2,190,174)SoB LLR Ruby: Earned 2,000,000 credits (2,201,813)SR5 LLR Silver: Earned 100,000 credits (292,115)SGS LLR Gold: Earned 500,000 credits (748,792)TRP LLR Gold: Earned 500,000 credits (675,047)Woodall LLR Amethyst: Earned 1,000,000 credits (1,210,464)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,016,453)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (25,001,013)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (16,858,065)PPS Sieve Emerald: Earned 50,000,000 credits (65,684,329)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (21,004,347)TRP Sieve (suspended) Jade: Earned 10,000,000 credits (10,080,762)AP 26/27 Turquoise: Earned 5,000,000 credits (5,177,651)GFN Jade: Earned 10,000,000 credits (10,325,889)PSA Double Silver: Earned 200,000,000 credits (267,901,478)
Message 69865 - Posted: 10 Oct 2013 | 22:26:03 UTC

Thank you for the link.

Haswell have avx2, maybe it will bring some improvement in few months. I had 2011 lga and a xeon e5-2660 but decided to go on a multiple boxes with hsw.

Either way, it's time to come back to PG. :)

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Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,038,739)Cullen LLR Ruby: Earned 2,000,000 credits (2,074,615)ESP LLR Ruby: Earned 2,000,000 credits (2,243,517)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,142,353)PPS LLR Turquoise: Earned 5,000,000 credits (7,292,925)PSP LLR Ruby: Earned 2,000,000 credits (2,232,103)SoB LLR Ruby: Earned 2,000,000 credits (2,934,612)SR5 LLR Ruby: Earned 2,000,000 credits (2,057,332)SGS LLR Turquoise: Earned 5,000,000 credits (5,231,028)TRP LLR Ruby: Earned 2,000,000 credits (2,420,063)Woodall LLR Ruby: Earned 2,000,000 credits (2,014,811)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (23,770,672)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (944,431)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,813,253)PPS Sieve Double Silver: Earned 200,000,000 credits (342,048,709)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,446,797)AP 26/27 Sapphire: Earned 20,000,000 credits (33,140,471)GFN Sapphire: Earned 20,000,000 credits (49,651,200)WW Turquoise: Earned 5,000,000 credits (7,792,000)PSA Sapphire: Earned 20,000,000 credits (20,457,430)
Message 69894 - Posted: 11 Oct 2013 | 11:20:04 UTC - in response to Message 69840.
Last modified: 11 Oct 2013 | 11:20:23 UTC



If it were me, given what I've read as well as my own first hand knowledge, in order to optimize for LLR I'd probably get a quad core Ivy Bridge i7 (with HT off) with 2400 speed memory. Take my advice with a grain of salt, however -- optimization is very complex and depends on many small details, and the results are not always what you expect. (I'm not addressing the dual vs. quad channel issue because I'm not sure about the details, but it sounds very reasonable.)


The other thing that comes into optimizing is is this the only project you will be crunching for and what happens when they change the software on the project end again? Yes ram speed is very important for this generation of the software at this project on this sub-project, but next time at another project or another sub-project it might not be. Each project, and sub-project, is slightly different, some markedly different, and unless you are only running one project and can foresee the future, finding a happy medium is best. Chances are you will never be number one, someone always has more money or resources and will be faster, so making your choices, for overall crunching, and then being happy with them is the best idea. It's like the old billboard ad...you buy a brand new computer and as you drive away they are changing the ad to show a brand new faster model that is available now that you already have yours. Chasing the peak can get REAL expensive, so buy as much as you can afford today, and be happy for the long run. If the answers were all found today what would we be crunching tomorrow?

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Discovered 8 mega primesFound 5 primes in the 2020 Tour de PrimesFound 2 mega primes in the 2020 Tour de PrimesFound 4 primes in the 2021 Tour de PrimesFound 2 mega primes in the 2021 Tour de Primes321 LLR Sapphire: Earned 20,000,000 credits (20,020,701)Cullen LLR Sapphire: Earned 20,000,000 credits (20,174,451)ESP LLR Sapphire: Earned 20,000,000 credits (23,496,803)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,473,530)PPS LLR Emerald: Earned 50,000,000 credits (61,332,778)PSP LLR Emerald: Earned 50,000,000 credits (51,069,305)SoB LLR Emerald: Earned 50,000,000 credits (51,885,310)SR5 LLR Sapphire: Earned 20,000,000 credits (20,183,763)SGS LLR Sapphire: Earned 20,000,000 credits (20,482,069)TRP LLR Sapphire: Earned 20,000,000 credits (20,307,419)Woodall LLR Sapphire: Earned 20,000,000 credits (46,282,667)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,380,527)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,007,004)PPS Sieve Double Gold: Earned 500,000,000 credits (578,571,690)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)AP 26/27 Sapphire: Earned 20,000,000 credits (31,418,153)GFN Double Gold: Earned 500,000,000 credits (527,960,365)WW Double Ruby: Earned 2,000,000,000 credits (2,000,640,000)
Message 69959 - Posted: 12 Oct 2013 | 22:32:00 UTC - in response to Message 69708.

Ok, there are many ways to help prime grid. And many computers to do it.
If you want to be at the cutting edge, DDR3 2400 and an Intel 4core chip.
I still think that if you have the cash go for 6 cores.

The case and fans are one of the most important aspects to get right. I use a full tower case that I bought in 1999 as a video editing suite. I re-used the case for my beast - 3 80mm fans - 1 at the front and 2 at the back. The top back fan started squealing so I attempted to replace all 3 fans with what I thought is good. Useless pieces of shite - no wind. I have my old fans back in my beast and going well.

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321 LLR Amethyst: Earned 1,000,000 credits (1,446,317)Cullen LLR Ruby: Earned 2,000,000 credits (2,100,744)ESP LLR Turquoise: Earned 5,000,000 credits (5,192,394)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,159,526)PPS LLR Amethyst: Earned 1,000,000 credits (1,307,875)PSP LLR Jade: Earned 10,000,000 credits (10,408,711)SoB LLR Sapphire: Earned 20,000,000 credits (23,757,093)SR5 LLR Ruby: Earned 2,000,000 credits (3,475,528)SGS LLR Amethyst: Earned 1,000,000 credits (1,085,939)TRP LLR Turquoise: Earned 5,000,000 credits (5,630,136)Woodall LLR Ruby: Earned 2,000,000 credits (2,035,102)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (2,146,795)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,190,376)Generalized Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,651,496)PPS Sieve Double Silver: Earned 200,000,000 credits (221,599,206)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (3,591,642)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,819,072)AP 26/27 Ruby: Earned 2,000,000 credits (2,150,876)GFN Sapphire: Earned 20,000,000 credits (25,369,275)WW Ruby: Earned 2,000,000 credits (4,848,000)PSA Sapphire: Earned 20,000,000 credits (38,445,145)
Message 70054 - Posted: 15 Oct 2013 | 15:12:01 UTC - in response to Message 69959.
Last modified: 15 Oct 2013 | 15:18:20 UTC

...And many computers to do it.
If you want to be at the cutting edge, DDR3 2400 and an Intel 4core chip.
I still think that if you have the cash go for 6 cores.


I think the only problem with that dilemma, is that you're completely right as things stand now - 6 IB cores, vs. 4 marginally faster Haswell cores with less L3 cache, will always win. But should the LLR exe be updated to use AVX 2 and/or FMA3, then that might change the game.

It's a shame Intel are playing "the long game", isn't it, I mean if Haswell-E was available today with DDR4 support then it would be a no-brainer. It might break the bank, but it would still be the obvious choice.

SSDs - so you've got one already and that's fine, but the Intel 530 series are meant to be extremely stable and, unlike Intel traditionally have been, they aren't horrendously overpriced. I've just got one, and as with my Sandy Bridge build, I'm going to put the OS and Browser on there, and fall back on (relatively) rubbish Seagate spinning HDs for pure storage. The lower capacity (~500GB) flavours are about the same price as a big box of DVD-Rs these days, depending where you get them from.

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