As someone may notice, with 186 and higher drivers, hardware PhysX selection option is disabled if Nvidia GPU and Non-Nvidia GPU are present in same system.darthcyclonis
from ngohq.com recieves official nvidia position
Ill explain why this function was disabled.
Physx is an open software standard any company can freely develop hardware or software that supports it. Nvidia supports GPU accelerated Physx on NVIDIA GPUs while using NVIDIA GPUs for graphics. NVIDIA performs extensive Engineering, Development, and QA work that makes Physx a great experience for customers. For a variety of reasons - some development expense some quality assurance and some business reasons NVIDIA will not support GPU accelerated Physx with NVIDIA GPUs while GPU rendering is happening on non- NVIDIA GPUs. I'm sorry for any inconvenience caused but I hope you can understand.
NVIDIA Customer Care"