PhysX restriction lifting was a driver bug

[GT_Forthelulz]

Link to fix article

Originally Posted by Anandtech

We just got done talking with NVIDIA about the matter and they clarified the issue for us. In what we expect is going to be a disappointment for many of you, the lack of a PhysX restriction on the current 257.15 beta drivers is a bug, not a feature - the restriction should have been in those drivers and it was not. NVIDIA will be reinstating the restriction in new downloads of the beta driver and in the WHQL build of these drivers.

Turns out it was just a bug in the drivers that Nvidia have already fixed in their 257.15 Beta Drivers