That explains why they artificially force PhysX to just 1 core. Because 1 is not enough, but 8 would be perfectly fine. Pathetic.

Btw, what's the trick for enabling this? Or you just enable it in-game and thats it? I've tried Mirror's Edge with and without PhysX on Core i7 and performance was just as ty as it was on my old E5200 @ 3,75GHz.