well the initiative exist even before nvidia aquire Aegia's PhysX. if it really successful we might have those extra eye candy that gpu physx has been doing for both amd and nvidia gpu now. but the plan was somehow got screwed up when havok got acquired by intel. then nvidia go to PhysX route instead and amd finally move along in 2009 with Bullet. Anandtech have article about havok FX and PhysX in the past:HavoK started as a software physics engine. FX is probably new and uses hardware instead. I haven't kept up with it as of late so I don't know much about the HavoK FX line yet.