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Message boards : Generalized Fermat Prime Search : Gefener 3.03 fails on slightly overclocked GPU

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Profile matszpk
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Joined: 4 Jun 08
Posts: 22
ID: 23704
Credit: 145,602,306
RAC: 2,066
321 LLR Bronze: Earned 10,000 credits (21,394)SGS LLR Bronze: Earned 10,000 credits (38,357)Woodall LLR Bronze: Earned 10,000 credits (79,240)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (102,235)PPS Sieve Double Bronze: Earned 100,000,000 credits (142,000,295)TRP Sieve (suspended) Bronze: Earned 10,000 credits (44,578)GFN Ruby: Earned 2,000,000 credits (3,309,192)
Message 79304 - Posted: 7 Sep 2014 | 7:21:09 UTC
Last modified: 7 Sep 2014 | 7:28:16 UTC

Hi, all.
I was overclocked slightly my GPU (radeon hd 7850). In the stock my card have: core=900MHz, mem=1200MHz.
Few months earlier, I overclocked to core=1000MHz, mem=1290MHz (and ofcourse I made stress tests like memtestCL and others).
In my current setup, Genefer fails after few minutes with maxErr exceeded error. How much is genefer sensitive for GPU memories clock (must be in stock frequencies)?
I am using AMD Catalyst 14.6 beta (from May) on the Linux 64-bit.
Thank you for any response.
PS: Fans speed while genefer computing was in 41% and GPU temp was not higher than 63C.

Profile matszpk
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Joined: 4 Jun 08
Posts: 22
ID: 23704
Credit: 145,602,306
RAC: 2,066
321 LLR Bronze: Earned 10,000 credits (21,394)SGS LLR Bronze: Earned 10,000 credits (38,357)Woodall LLR Bronze: Earned 10,000 credits (79,240)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (102,235)PPS Sieve Double Bronze: Earned 100,000,000 credits (142,000,295)TRP Sieve (suspended) Bronze: Earned 10,000 credits (44,578)GFN Ruby: Earned 2,000,000 credits (3,309,192)
Message 79305 - Posted: 7 Sep 2014 | 8:41:22 UTC - in response to Message 79304.

I fixed problem. Now I am crunching on mem=1270MHz. and apparently is good (no errors).
That rights. genefer is very sensitive for mem overclocking.

Profile matszpk
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Joined: 4 Jun 08
Posts: 22
ID: 23704
Credit: 145,602,306
RAC: 2,066
321 LLR Bronze: Earned 10,000 credits (21,394)SGS LLR Bronze: Earned 10,000 credits (38,357)Woodall LLR Bronze: Earned 10,000 credits (79,240)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (102,235)PPS Sieve Double Bronze: Earned 100,000,000 credits (142,000,295)TRP Sieve (suspended) Bronze: Earned 10,000 credits (44,578)GFN Ruby: Earned 2,000,000 credits (3,309,192)
Message 79316 - Posted: 7 Sep 2014 | 16:29:10 UTC - in response to Message 79305.

After 7 hours of crunching error was encountered again :(. Currently I stopped crunching of genefer.

Profile sergeProject donor
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Posts: 112
ID: 144858
Credit: 286,820,942
RAC: 10,524
Discovered 3 mega primesEliminated 2 conjecture "k"s321 LLR Turquoise: Earned 5,000,000 credits (5,342,838)Cullen LLR Silver: Earned 100,000 credits (158,983)ESP LLR Gold: Earned 500,000 credits (505,527)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,268,642)PPS LLR Emerald: Earned 50,000,000 credits (60,037,309)PSP LLR Silver: Earned 100,000 credits (120,541)SoB LLR Amethyst: Earned 1,000,000 credits (1,280,028)SR5 LLR Ruby: Earned 2,000,000 credits (2,649,390)SGS LLR Gold: Earned 500,000 credits (518,356)TRP LLR Silver: Earned 100,000 credits (141,131)Woodall LLR Silver: Earned 100,000 credits (116,405)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (235,088)PPS Sieve Amethyst: Earned 1,000,000 credits (1,031,526)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Gold: Earned 500,000 credits (500,445)TRP Sieve (suspended) Gold: Earned 500,000 credits (507,938)AP 26/27 Turquoise: Earned 5,000,000 credits (5,078,008)GFN Double Silver: Earned 200,000,000 credits (204,033,255)WW Ruby: Earned 2,000,000 credits (2,004,000)PSA Silver: Earned 100,000 credits (291,533)
Message 79319 - Posted: 7 Sep 2014 | 17:16:58 UTC

Read http://www.primegrid.com/forum_thread.php?id=4148

TL;DR: don't OC.
Especially memory: the makers of the card already did it for you; they "bin" the cards based on internal testing and sell them for more or for less.

Profile matszpk
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Joined: 4 Jun 08
Posts: 22
ID: 23704
Credit: 145,602,306
RAC: 2,066
321 LLR Bronze: Earned 10,000 credits (21,394)SGS LLR Bronze: Earned 10,000 credits (38,357)Woodall LLR Bronze: Earned 10,000 credits (79,240)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (102,235)PPS Sieve Double Bronze: Earned 100,000,000 credits (142,000,295)TRP Sieve (suspended) Bronze: Earned 10,000 credits (44,578)GFN Ruby: Earned 2,000,000 credits (3,309,192)
Message 79401 - Posted: 9 Sep 2014 | 19:26:21 UTC - in response to Message 79319.

Thank you for advance
Nevertheless my graphics card successfuly crunched one Genefer WU on mem=1255MHz, core=1000MHz.

Yves Gallot
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Message 79404 - Posted: 9 Sep 2014 | 21:03:56 UTC - in response to Message 79401.

Thank you for advance
Nevertheless my graphics card successfuly crunched one Genefer WU on mem=1255MHz, core=1000MHz.

Did you try this?
http://www.primegrid.com/forum_thread.php?id=5255&nowrap=true#78922
10% faster at the same clock speed!

Profile matszpk
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Joined: 4 Jun 08
Posts: 22
ID: 23704
Credit: 145,602,306
RAC: 2,066
321 LLR Bronze: Earned 10,000 credits (21,394)SGS LLR Bronze: Earned 10,000 credits (38,357)Woodall LLR Bronze: Earned 10,000 credits (79,240)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (102,235)PPS Sieve Double Bronze: Earned 100,000,000 credits (142,000,295)TRP Sieve (suspended) Bronze: Earned 10,000 credits (44,578)GFN Ruby: Earned 2,000,000 credits (3,309,192)
Message 79405 - Posted: 9 Sep 2014 | 21:39:14 UTC - in response to Message 79404.
Last modified: 9 Sep 2014 | 21:46:45 UTC

I did know about this trick, however I was crunching on the standard setup for OpenCL.
Ok. I can try.
EDIT: I confirmed. This is weird, but without optimizations is 10%-13% faster. I will try without changing setup and I will check stability.
Thank you for any advance.

Profile Gary Craig
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Joined: 30 Dec 09
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ID: 52890
Credit: 1,005,618,748
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Discovered 1 mega prime321 LLR Ruby: Earned 2,000,000 credits (2,893,273)Cullen LLR Ruby: Earned 2,000,000 credits (2,440,687)ESP LLR Turquoise: Earned 5,000,000 credits (5,738,876)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,292,626)PPS LLR Turquoise: Earned 5,000,000 credits (9,648,951)PSP LLR Turquoise: Earned 5,000,000 credits (5,653,927)SoB LLR Jade: Earned 10,000,000 credits (10,558,341)SR5 LLR Turquoise: Earned 5,000,000 credits (5,748,705)SGS LLR Ruby: Earned 2,000,000 credits (3,335,713)TRP LLR Jade: Earned 10,000,000 credits (12,602,818)Woodall LLR Ruby: Earned 2,000,000 credits (2,282,622)321 Sieve (suspended) Gold: Earned 500,000 credits (740,566)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (59,788,598)Generalized Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,143,068)PPS Sieve Double Gold: Earned 500,000,000 credits (524,673,938)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Jade: Earned 10,000,000 credits (10,130,821)TRP Sieve (suspended) Jade: Earned 10,000,000 credits (10,074,710)AP 26/27 Sapphire: Earned 20,000,000 credits (43,842,888)GFN Double Silver: Earned 200,000,000 credits (224,648,943)PSA Emerald: Earned 50,000,000 credits (62,378,755)
Message 79407 - Posted: 10 Sep 2014 | 0:22:06 UTC - in response to Message 79405.

In addition to stability, also check temperature. If it is running faster, it is running hotter, or at least making the fans work harder.

Glad things are working for you though!

--Gary

Profile matszpk
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Joined: 4 Jun 08
Posts: 22
ID: 23704
Credit: 145,602,306
RAC: 2,066
321 LLR Bronze: Earned 10,000 credits (21,394)SGS LLR Bronze: Earned 10,000 credits (38,357)Woodall LLR Bronze: Earned 10,000 credits (79,240)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (102,235)PPS Sieve Double Bronze: Earned 100,000,000 credits (142,000,295)TRP Sieve (suspended) Bronze: Earned 10,000 credits (44,578)GFN Ruby: Earned 2,000,000 credits (3,309,192)
Message 79413 - Posted: 10 Sep 2014 | 7:05:21 UTC - in response to Message 79407.

Temperature of GPU core was OK (not hotter than 63C) , but doesnt exist method to check GPU memory temp (ofcourse).
gfx card was working good even its temp was greater than 70C (when I was torturing it with using matrix multiplication: sgemm :) ).
Unfortunatelly genefer WU with 'trick' failed on slighty overclocked mem (1255MHz) :(.
Maybe depends on average number of operations on GPU mem (faster=hotter).

Message boards : Generalized Fermat Prime Search : Gefener 3.03 fails on slightly overclocked GPU

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