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There's GPU PhysX, and there's general PhysX, it sounds like you've either not got GPU PhysX enabled, or something's changed and they've dropped GPU PhysX. I think it's more likely to be that you've not got GPU PhysX enabled though.
:S weird I believed only nVidia cards could do PhysX. Are you sure his is doing physX?
It does work on AMD cards, but can chew your frame rate as it's all done by the CPU.
(Judging by various forum posts and tests)
Game isn't out is it?!
Lol so you can still run full physx with a 2500k and an amd card and get 60FPS? Hope you didn't get your 660 on the basis of physx.