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FAQ interessante presa dal link ^^
Q: Which NVIDIA GPUs support hardware PhysX acceleration?
A: GeForce 8 series and later (with a minimum of
32 cores and a minimum of
256MB dedicated graphics memory).
Q: Is there a large drawback if I have a secondary GeForce connected to low-speed PCIe-slot (
8x/4x/1x instead of 16x)?
A: It may affect benchmarks, but it doesn't affect actual games much.
Even 4x and 1x modes should be just fine
Q: What exactly affects PhysX performance?
GPU/Memory/Shader clocks or
dedicated memory?
A: Shaders/Cores amount on your GPU,
more cores = better performance. Thus,
Shader clock is the most important of the three. As for dedicated memory, 256 MB should be enough for everything we currently have among PhysX apps/games.
Q: Some particular app/game seems to refuse to use hardware PhysX, although everything else is working fine.
A: First make sure it does support hardware PhysX acceleration. Open a folder of that app/game,
search for "physx*" dll-files and try deleting (or renaming) them, so only installed PhysX System Software will be used. It could be "
PhysXDevice.dll", "
PhysXLoader.dll", "
PhysXCore.dll" etc. For example, to enable GPU-PhysX in Mirror's Edge you must delete/rename PhysXDevice.dll and PhysXCore.dll from \Binaries\ dir.
Q: How do I make CUDA apps work with my hybrid config?
A: You don't. Developers should do it. GPU-PhysX is working through CUDA, this means CUDA is not blocked by a driver.
Q: GPU-Z or other software says my NVIDIA GPU doesn't have CUDA/PhysX supported. Why?
A: Because such software does not always correctly work with hybrid configurations. Use a FluidMark to see if GPU-PhysX works.