[eq-dev] Windows 7 vs Multi-GPU rendering problems

[JohnZo]

I am just starting to experiment with multi-GPU OpenGL rendering on Windows
7.
For now, I am using a pair of Geforce GTX 580 graphics cards in one PC, with
two LCD displays (one per graphics card). I disable SLI in order to have
access to the two graphics cards.

I try to have one process creating two OpenGL windows (one per graphics
card). It works, but whatever I do, I don't get the performance benefits of
the second card: all OpenGL calls are being sent (and processed) by the same
graphics card.

I tried the same thing with AMD FirePro cards, and it works well.

Does anyone know if there's a way to support multi-GPU OpenGL rendering with
nVidia Geforce cards?
Is it something that the Equalizer library is known to do?

Thanks,

John.

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[Stefan Eilemann]

On 18. Jan 2012, at 13:37, JohnZo [via Software] wrote:

> I am just starting to experiment with multi-GPU OpenGL rendering on Windows 7.
> For now, I am using a pair of Geforce GTX 580 graphics cards in one PC, with two LCD displays (one per graphics card). I disable SLI in order to have access to the two graphics cards.
>
> I try to have one process creating two OpenGL windows (one per graphics card). It works, but whatever I do, I don't get the performance benefits of the second card: all OpenGL calls are being sent (and processed) by the same graphics card.
>
> I tried the same thing with AMD FirePro cards, and it works well.
>
> Does anyone know if there's a way to support multi-GPU OpenGL rendering with nVidia Geforce cards?

See http://www.equalizergraphics.com/documentation/parallelOpenGLFAQ.html#multigpu

Short story: You can't with Geforce on Windows. You can on Linux.

> Is it something that the Equalizer library is known to do?

Yes, using Quadro cards on Windows.

HTH,

Stefan.

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