The thing about physx is it may be open to be used by anyone, but its not a standard and its not open source.

Once it actually becomes a standard and open source... where it can actually be applied in many more games for more than just special effects... you'll see performance increases... and in general just better physics...

Thats what I don't like about physx... it has the potential (even though atm it takes a relatively big performance hit) to do something worth while in the world (not only with gaming) and yet nvidia isn't letting it run free (disabling it in the presence of an AMD card....wtf?)

If nvidia let free physx the gaming world would be a much better place on many levels (literally and figuratively)