How do I confirm dual GPUs are working?
14 Dec 2012 21:08:36 UTC
Topic 196685
(moderation:
Just fired up a new computer with dual NVIDIA 680s. The computer/video card controlling software sees both cards (have resistors in a VGA plug on the non-monitor card).
Under tasks it shows only on GPU working, but I read that might be normal with SLI.
Under my Team USA profile it only shows one GPU running however. I have seen other folks were a (2) shows dual GPU work underway.
Is my second GPU working? How do I confirm and if it isn't working how do I get it to work.
PS This hummer can contribute well to our petaflop goals :-)
Harald
How do I confirm dual GPUs are working?
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Hi!
By default, BOINC will not automatically use all of your GPUs, but there is a way to force BOINC to do so, see this discussion for details
http://einsteinathome.org/node/196636&nowrap=true#120298
Cheers
HB
RE: By default, BOINC will
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BOINC uses only the best GPU that it detects, and it determines which is best on the following factors, in decreasing priority:
1 - compute capability
2 - software version
3 - available memory
4 - speed
If a user has two identical videocards with the same GPU on them, BOINC should use them both automatically. Unless one of the above differs between videocards, and in this case that's usually caused by the memory detection bug, where one GPU will be detected having e.g. 8TB of memory and the other 'only' 4GB. Then the '8TB GPU' is preferred. And then you need to use the workaround.
From BOINC 7.0.36 this is fixed. However, you will need an empty work-cache before changing over to this version or any of the later ones, as else all GPU work will err with a "maximum time exceeded" error. Only new work downloaded onto a system running these BOINC versions will run to completion.
Danke Schoen! To be honest
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Danke Schoen!
To be honest I decided to use the beta version for W7 64bit and I have both cards cranked up just fine now.
Appreciate the speedy help to get me crankin'!!!
HB