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Message boards : Graphics cards (GPUs) : Quad Sli Support?

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Paul
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Message 8731 - Posted: 22 Apr 2009 | 17:18:33 UTC
Last modified: 22 Apr 2009 | 17:25:13 UTC

I have 2 295 gtx's and was wondering if quad sli was supported?

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Message 8733 - Posted: 22 Apr 2009 | 18:20:22 UTC

Unless SLI is disabled (regardless of version), the GPUGRID application will execute on only one GPU. As I understand it, this is not a limitation of the GPUGRID app., but a more general restriction in CUDA (at least until NVIDIA addresses it).


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Message 8741 - Posted: 22 Apr 2009 | 20:20:19 UTC

Yes, SLI has to be disabled for several chips to be recognized. It's a limitation of the current CUDA drivers. 3 of your 4 GPUs should work, but the detection and utilization of the 4th one has recently been troublesome for some people.

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Message 8780 - Posted: 23 Apr 2009 | 12:17:34 UTC
Last modified: 23 Apr 2009 | 12:18:44 UTC

I was worried about this 3 of 4 only thing myself and must say not a spot of bother. Dropped the second card in and doubled my processing. I guess that ones been solved.

Edit: You can use the Quad SLI cable (i do) but disable SLI in control panel for crunching. Then you can still enable to play games. thats what ive done.

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Message 8789 - Posted: 23 Apr 2009 | 14:00:02 UTC - in response to Message 8780.

Thanks for responses fellas. Disable sli and use 3 cores. Got it thanks.

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Message 8888 - Posted: 25 Apr 2009 | 11:44:42 UTC - in response to Message 8789.

Well, it *should* use all 4 GPUs and currently there's no way to intentionally limit this number to 3 or 2. The comment about 3 of 4 was just to tell you there might be problems, but they don't affect everyone.

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Message boards : Graphics cards (GPUs) : Quad Sli Support?

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