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PhysX SDK is written on CUDA and works only on NVIDIA GPUs
For PhysX SDK 2.x: Actually, only some parts of PhysX SDK code were rewritten on CUDA after Ageia was aquired by NVIDIA, to support hardware acceleration on NVIDIA GPUs. Main in-game physics calculations, like collision detection, character controller, rigid body physics or ragdolls, are always running on CPU (even in games with GPU PhysX support). GPU hardware acceleration, in other case, is used mostly for additional physics effects, like particles (fluids, dynamic smoke, debris and chunks from explosions) and cloth (clothing and hair simulation on characters, cloth banners and flags).
Thus, if you plan to integrate PhysX SDK into your game engine, or use PhysX plug-ins, you don't need an NVIDIA GPU, unless you'll want to use hardware accelerated features. Source: http://physxinfo.com/wiki/Category
hysX_SDK
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