Forum > GPU crunching

BOINC 6.6.20 x64 does not run on 2 GPUs on Win 7

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Raistmer:

--- Quote from: FalconFly on 10 May 2009, 10:05:53 am ----- edit --

http://setiathome.berkeley.edu/show_host_detail.php?hostid=4900487

Same Driver, so it does seem to work under Windows 7 x64 at all, but these are 2 individual GTX285...
Might be a problem with the dual GPU cards then.

--- End quote ---
Win2003 Server x64 works OK with 182.50 and 2 GPUs.
You could try this OS or WinXP 64.
It seems new M$ OSes should be avoided as long as possible if you value your time and nerves ;)

FalconFly:
Hehe, I hear you ;)

The horrors I went through just navigating through Windows 7 RC were insane, even with everthing possible switched back to "oldschool" I can already say that I will avoid that for as long as possible.
(since it's supposed to run just less than a month for me and it was free, I just took a shot at it)

I sure wish there would be a Linux CUDA SETI available already, then I'd happily take that.

Devaster:
now i am using two gpus - one as primary display and second as psychx card ...

Pappa:
That is a problem identified by Paul Buck BOINC and one of the reasons that even into 6.6.23. The logic for detecting of GPU's had a problem, the fix disabled Some GPU's because they were not similar. Paul's  295 (times 2 for 4 GPU's) reported less memory for the second GPU, thus were negated. If I recall correctly, it was corrected in 6.6.26 but then other issues were reported. 6.6.28 is the current testing version which has proper detection working.

FalconFly:
Ha !

IT WORKS ! :) :)

Definitely the combination of Windows 7 x64, Dual GPU card (GTX295) and the x64 185.85WHQL Driver that caused my Problems.

Now BOINC 6.6.20 Win32 runs under XP SP3 32bit, and immediately recognized all 4 GPUs of my two GTX295, my app_info.xml works like a charm there (updated my previous post).

So it looks like Single GPU cards will likely run normal in pairs/triple even under Windows 7 (such Host exists in the SETI Top Computer ranking), but it fails to do so when DualGPU Cards (like the GTX295) are used.
I assume another Driver (other than 185.85WHQL) might fix the problem, otherwise the V10a Team Mod is the only way I know to fill DualGPU cards under Windows 7 at this time...

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