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Message boards : Graphics cards (GPUs) : Selecting GPU

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Karplusan
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Message 7869 - Posted: 26 Mar 2009 | 18:40:53 UTC

I have two video cards, usually in SLI mode, when I'm gaming. But when I'm not gaming, I turn SLI off to be able to run multiple GPUGrid Work Units.

I currently only have one Work Unit, and two video cards. If I can tell it to use the one that is not attached to the monitor, then I will not be losing performance for general computing. Is there a way to tell it to use the other video card?

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Profile Paul D. Buck
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Message 7870 - Posted: 26 Mar 2009 | 18:48:17 UTC - in response to Message 7869.

I have two video cards, usually in SLI mode, when I'm gaming. But when I'm not gaming, I turn SLI off to be able to run multiple GPUGrid Work Units.

I currently only have one Work Unit, and two video cards. If I can tell it to use the one that is not attached to the monitor, then I will not be losing performance for general computing. Is there a way to tell it to use the other video card?

If you start BOINC while in SLI mode it won't see the other "core". You should see the correct number of cores in a message when BOINC starts ... note this is for 6.5.0 and later ... 6.4.5, you have to manually tell it how many cores there is ... and there may be other issues with switching in and out of SLI mode...

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Karplusan
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Message 7872 - Posted: 26 Mar 2009 | 18:54:50 UTC - in response to Message 7870.

I know it will only see one card while in SLI mode, that is why I turned it off. But right now, I only have one Work Unit, Two Cores, and we are using the same card, how can I move the Work Unit to the unused card?

SLI has been off for several days, I don't really need it anyways as I cannot visually see a performance difference when it is on or off.


Thanks for the tip though, I'll try to remember to restart BOINC if/when I switch SLI mode again.

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Karplusan
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Message 7880 - Posted: 26 Mar 2009 | 20:27:07 UTC - in response to Message 7872.

Turning on SLI seemed to work for my purposes. I only have 1 Work Unit, so I only need 1 visible Core. In SLI, I am no longer noticing a unusual FPS drop while moving windows around, minimizing and maximizing web pages, etc...

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Message boards : Graphics cards (GPUs) : Selecting GPU

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