Thx for your reply, albeit not very helpfull...
"using an amd card for rendering and nvidia card for physics won't work"
This does work of course; as stated in my post. It is even working in the Cryostasis demo; or I would - like you said - have gotten only single digit benchmark scores (because my cpu would have to calculate the physx stuff).
I already heard that this game doesn't run well with an AMD 5870; I just wanted that confirmed (about 30 FPS with all settings maxed out and physx disabled??).
And I wanted to know if something in the physx-department is different between the demo and the full game; or why else would there be such a performance difference when physx is enabled if not because of my Geforce not calculating physx?
Thanks again; hopefully someone can clarify this...
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