Nvidia essentially forces AMD to clone whatever bullshit they do next, or else Nvidia will fixate on it and crow about how AMD can’t do [blank]. It’s a pattern of anticompetitive behavior. It only works because Nvidia has such a dominant market share… and it is a method to preserve and deepen that divide. They do not want fair comparisons between their hardware and AMD’s, and they actively prevent software compatibility. This has been going on so long that I used to type this up about nVidia and ATI.