Nvidia PhysX free for all - but via CUDA only.
With
CUDA integrated into the driver,
AMD could use
PhysX with their more recent graphics cards. At first sight the integration of the technology doesn't have many drawbacks. Since
Nvidia is supposed to add
PhysX support to the "The way it's meant to be played” program, there should be a lot of games supporting the physic architecture in the future.
But
AMD could also, in addition to their Californian rival's solution, use
Intel's
Havok, to make all the options available to their own customers - but even then it would be the question if game developers would integrate two physic engines into their games.