Forum > GPU crunching
x38g reports
Jason G:
--- Quote from: perryjay on 07 Aug 2011, 02:03:19 pm ---Here's one that is interesting. Must say they tried their best to prove me wrong but finally gave up and gave me credit. http://setiathome.berkeley.edu/workunit.php?wuid=783092275
--- End quote ---
You're also canonical, not that surprisingly with all those apps erroring out.
Jason
Terror Australis:
Using 275.33/38g & 39f I have a downclocking problem with one particular card. There is no problem using 191.07/6.09.
It's one of 2 EVGA GTX285 FTW's in the same box, the other card behaves itself perfectly. I have confirmed it's the card by swapping cards between the sockets.
Jason. As there are two identical cards, one which plays up and one which doesn't. Are there any tests you would would like me to run on the cards to help track down the reason for the downclocking issue in general ?
T.A.
Jason G:
One thing that has become apparent lately, is that some of the optimised code may be pushing harder than some OC scanning tools. It is the 560tis that came under scrutiny first for being close to the edge from factory, and seems to have some per manufacturer &/or per Silicon differences.
As a result of the ongoing examination, I may need to take some of the 'hottest' running Cuda kernels, and make some more targeted scanning tool out of it. In the meantime I suggest see what happens if you back the suspect card right down to reference clocks. If that still doesn't help there could be further issues.
If it turns out I am pushing harder that whatever the factories use to bin parts for factory OC models, then I may have to look at some sortof backoff throttle.
Jason
Terror Australis:
On clser examination there is a possibility it's related either to certain WU's or series of WU's.
THE FTW cards are factory OC'ed to 725MHz, I have backed them off to 715MHz and it still drops to half speed with the same degree of randomness.
Two WU's in question are here and here
T.A.
Jason G:
--- Quote from: Terror Australis on 09 Aug 2011, 05:39:30 am ---Two WU's in question are here and here
--- End quote ---
Thanks, no indication of a cause in those, so we'll keep looking.
What are the temps like going at flat chat?
It's stability of my code (exhibiting apparent task dependency) versus Factory OC's that are in question, i.e. Higher stock than nVidia reference.
nVidia reference clocks for GTX 285 are:
Core: 648 MHz
Shader: 1476 MHz
Mem: 1242 MHz
Still crook at those ?
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