There's a rumor going around that blames AMD's low Gears of War performance on Nvidia's PhysX API. The truth is somewhat more complicated, and there's no clear answer as to what's harming AMD's ...
As in use the 2nd GPU as dedicated physx and the 50xx as your video card? Has anyone actually tried that? I can't imagine that's a configuration that's had any testing by Nvidia themselves. I did skim ...