Stefan Eilemann wrote:
> 
> Yes. The multi-GPU implementation in the driver changed with the 190
> series to support the Win7 driver model. This broke GPU-affinity
> windows until the 265 series. On XP, you can activate the old
> implementation using the "enablemmb.exe" from nVidia, if you can get
> hold of it [1].
> 

OK, using the disableMMB.exe, it works on XP, but with exactly the same
performance problems as on Win7/Linux.

Also, I finally posted on the nVidia forums:

http://forums.nvidia.com/index.php?showtopic=194330

Cheers,
Marc

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