AMD sort-of-news devolves into flame war. Colour me shocked!
FUN FACT #1: ATI looked at buying AGEIA but wouldn't meet the asking price.
FUN FACT #2: Nvidia offered AMD a PhysX licence (after paying the $150 million asking fee to buy AGEIA), but AMD decided to go with HavokFX, because OpenCL gaming was the next big thing. This is the same Havok that required a licensing fee and was supported by exactly zero games.
FUN FACT #3: When the PhysX hack for AMD cards arrived, it was AMD who threw up the roadblock.
So, ATI/AMD couldn't be bothered buying PhysX, couldn't be bothered licensing it once Nvidia purchased it, and actively blocked the development of a workaround that would allow the AMD community from using it. If you have an Nvidia card you can use it. If you have an AMD card, why should you care? AMD certainly don't.
FUN FACT. LEGAL REASONS.
And so what if TressFX uis limited only to hair. It does work on ANY graphic card with DirectCompute support. You can't even have PhysX hardware accelerated hair if you just happent o have Radeon...