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drummers-lowrise
1) Message boards : Generalized Fermat Prime Search : Have OCL1 reached any paramter limits? (Message 155192)
Posted 281 days ago by shinozkProject donor
Thanks.
2) Message boards : Generalized Fermat Prime Search : Have OCL1 reached any paramter limits? (Message 155187)
Posted 282 days ago by shinozkProject donor
My GFN21 tasks have many maxErr recently.
maxErr exceeded for 801998^2097152+1, 0.5000 > 0.4500
(http://www.primegrid.com/result.php?resultid=1336857496)

I dont think it means a hardware failar, since all tasks with many maxErr dont became invalid.
It occors on the stock clock.

Wingmen tasks show that it seems occor only in OCL1 of GFN21.
The wingman tasks, Tesla, have the same errors.
http://www.primegrid.com/result.php?resultid=1281962873

Have OCL1 reached any paramter limits in GFN21, such as B limits?
3) Message boards : Generalized Fermat Prime Search : GFN21 GFN22 Scoreboard, post your times/hardware (Message 120718)
Posted 1589 days ago by shinozkProject donor
TITAN V: 4 h

Tesla V100-SXM2-16GB: 3 h 07


Titan V may be limited by memory-bandwidth for ocl in GFN21.
GPU-Z
GPU-Z shows that PrefCap-Reason is nothing and Memory-Controller-Load is maxed out.
Power-Consumption never goes above 60%(=150W).

Tesla(900GB/sec) vs Titan V(653GB/sec) = 3h vs 4h

4) Message boards : Generalized Fermat Prime Search : GFN21 GFN22 Scoreboard, post your times/hardware (Message 120536)
Posted 1598 days ago by shinozkProject donor
TITAN V (OC: GPU+65MHz , MEM+175MHz)

GFN21: 13,420 seconds
5) Message boards : Number crunching : LLR 3.8.20 Going Live! (Message 106440)
Posted 2136 days ago by shinozkProject donor
For benchmark of multi-threaded LLR, can we use Prime95.exe v28.10?
Both use LLR v3.8.20.

6) Message boards : Number crunching : ram, rank and AIDA64 (Message 95186)
Posted 2445 days ago by shinozkProject donor
How about third tier timings?

Asus says "the third tier of memory timings – read to read, read to write, write to write and write to read are larger factors in memory performance than the primary timing set."

http://rog.asus.com/forum/showthread.php?51063-The-Haswell-E-Overclocking-Thread-and-Overclocking-Guide

This is the biggest factor of DDR4: RTL
http://overclocking.guide/x99-ddr4-memory-overclocking-guide/
7) Message boards : Number crunching : A new machine (Message 73504)
Posted 3272 days ago by shinozkProject donor
I do not know a detail because I do not have a memory of GSkill.

A overclocking memory may have only a few profiles in XMP.

I use a 2400 memory of Team group.
My memory has only 1333,2133 and 2400 in XMP.

If your memory does not have 1866, you may not use 1866.
8) Message boards : Number crunching : Best CPU for LLR/GFN? (Message 73395)
Posted 3276 days ago by shinozkProject donor
For comparison, I disable 2 cores of 4960x in BIOS to make 4-core system because I don't have 4-core CPU.
The size of L3 cache is diffrent from that of a genuine 4-core sytem.

4960x(3.7GHz, Core 4, HT off)
dual-channel(1333) 2.1hours 65W (http://www.primegrid.com/result.php?resultid=523720913)
quad-channel(1333) 2.1hours 70W (http://www.primegrid.com/result.php?resultid=523762116)


In conclusion,

4960x(3.7GHz, Core 6, HT off)
dual-channel(1333) 3.5hours ; 6.9WU/day * 6Core = 41.4WU
quad-channel(1333) 2.3hours ; 10.4WU/day * 6Core = 62.4WU
quad-channel(2400) 2.2hours ; 10.9WU/day * 6Core = 65.4WU

4960x(3.7GHz, Core 4, HT off)
dual-channel(1333) 2.1hours ; 11.4WU/day * 4Core = 45.7WU
quad-channel(1333) 2.1hours ; 11.4WU/day * 4Core = 45.7WU

The bandwidth of dual-channel memory is exhausted by 4 core.
The productivity for 6 core with dual-channel memory is about same as that for 4 core.
Moreover, quad-channel memory for 4-core system is less important.

9) Message boards : Number crunching : Best CPU for LLR/GFN? (Message 73390)
Posted 3276 days ago by shinozkProject donor
I run SR5 with memory overclocking to 2400cl9.

4960x(3.7GHz, Core 6, HT off)
dual-channel(1333) 3.5hours 85W (http://www.primegrid.com/result.php?resultid=523564454)
quad-channel(1333) 2.3hours 95W (http://www.primegrid.com/result.php?resultid=523629619)
quad-channel(2400) 2.2hours 96W (http://www.primegrid.com/result.php?resultid=523689530)

For current SR5, I conclude that if we use 6 core with stock clock, we must use the quad-channel, and further memory OC is less important.

For a large FFT or CPU overclocking, the memory OC may become imporant.

10) Message boards : Number crunching : Best CPU for LLR/GFN? (Message 73364)
Posted 3276 days ago by shinozkProject donor
The effects of the quad-channel memory become more important for IB-E or IV-E.

I run SR5 with 4960x@stock(IV-E).
When all 6 cores are running, the turbo-boost technology sets the frequency of the 4960x to 3.7GHz.
And I select 1333cl9 for memory clock, because my memory module does not have 1600 in XMP.

The result is :

4960x(3.7GHz,1333cl9, Core 6, HT off)
dual-channel 3.5hours 85W (http://www.primegrid.com/result.php?resultid=523564454)
quad-channel 2.3hours 95W (http://www.primegrid.com/result.php?resultid=523629619)

The watt of the CPU is measured by HWINFO64. The lower watt means a memory starvation.


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