Anyone running Nvidia driver version 186 will find PhysX acceleration disabled when ATI hardware is also present in the system, SlashGear reported.
Nvidia customer service responded to a user regarding the issue, saying, "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."
The email continued to list a couple of reasons why the Nvidia GPU would refuse to accelerate PhysX, with one of them being, of course, for business.
"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," it read. "I’m sorry for any inconvenience caused but I hope you can understand."