I don"t know why so many AMD users want Physx support. It's hardly used and isn't any better then other stand alone phyics engines.As an Nvidia user the beat feature I've found on Geforce cards is the quality of service from the Nvidia only board partners.
exactly for that reason, if it's nvidia specific no one will be enjoying it, not enough games using it for nvidia users, or amd users get screwed up physx like in the last batman because devs dont have time to integrate both physx correctly, if both vendors use it, might be a chance to see it take off and get wider adoption.