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Didn't think there was physX support in the really old nvidia driversThe only way you can do it at the mo is by using really old nvidia drivers on Win7 or XP - I played through mirror's edge with a 4870 and a 9500GT for physx, but more recent drivers have this function locked out.
It's an absolutely awful decision by nVidia tbh.
Nope, nVidia has disabled that feature. You can't run and AMD GPU and a nVidia card as PhysX, sorry.
What games actually use PhysX?