I question why Ati/AMD abandoned the original crossfire concepts to just do the the quick easy cheap thing Nvidia did with SLI. Money/Budget restraints why AMD purchased Ati?
Either way if AMD went back and redeveloped the idea of having two cards. Each rendering positive and negative frames to have true 100% performance increase I some how believe no one would ever buy a NVidia chip again. True 100% scaling should happen on AMD's end. Not the game developers. This is why multi GPU setups have been a let down. You never get true 100% cause you can not really get that all the time cause of the way it's designed. If AMD went back and made a new version of Xfire with the original concepts in mind they would take over the GPU mobo market share and Nvidia wouldn't have a response for quite some time.
The question is is AMD just a copy cat or are they innovative ?