I was testing those Sample Demos (win64), e.g SampleCloth64, SampleSoftBody64, etc. given by PhysX SDK 2.8.4.
All the demos work fine under the software mode, but not under the hardware mode. Under the hardware mode, all the cloth, softbody, fluid objects cannot be created and disappear in the scene.
The error message in the console is:
D:…\PhysXSDK2.8.4\trunk\SDKs\Physics\src\NpPhysicsSDK.cpp(180): unknown error: Kernel execution failed.
The graphics card on my machine is nVidia GeForce GTX 660 which is CUDA supporting, PhysX supporting, and the OS is Vista 7 64-bit.