... So what?
I remember a loooot of games "Nvidia the way it's meant to be played" which worked better on ATi.
In the case of Cryostasis, neither ATi nor nVidia have good performance, the brand is not the problem, and as far as I know, the other PhysX games aren't slower on ATi than nVidia without PhysX,
Mirror's Edge is a good exemple.
So stop trolling... ATi is not the problem, PhysX is deactivate. The only difference between nVidia and ATi in this game is that ATi hadn't all the useless physx effects... So, I repeat, yes, I believe that a game with PhysX support will run well on my card without PhysX effects, and that is the way it should be...
No need to discuss about the two 3D Card manufacturer, there will be a patch, so there are no problems anymore.