Unity's Joint system works on PhysX? So it won't work for anyone with an ATI video card?

I was reading the manual for the Configurable Joint, and noticed the first line on the page reads:

“Configurable Joints are extremely customizable. They expose all joint-related properties of PhysX”

I am a little confused by this. Does this mean that the various Joint components in Unity use PhysX for physics simulation and not Unity’s own physics engine?

And does this mean then that this will not work on a computer that does not have a PhysX capable Nvidia video card?

PhysX is Unity’s physics engine. It will work on any platform that Unity supports. You’re thinking of PhysX acceleration using Nvidia-only hardware, which Unity does not do. (FYI, it is quite fast even on the CPU.)

Actually Physx is Nvidias physics engine that is used in Unity.
But it doesn’t matter what type of gpu you have.

Yeah, it’s only hardware acceleration that’s Nvidia-specific. The physics engine itself will work on anything.

Also Box2D for 2D physics. So the two physics engines Unity uses are PhysX and Box2D. There are no vendor-specific hardware dependencies of any kind.

–Eric