nvidia backed at consoles are their choice of course but is it because they wanted to or because of the things than can't match amd like price.

and for the console port games performance i think like you. but if amd supply a good console to pc port tool with it's sdk for xbox this can easily change. back in that times amd didn't interested on software side to much but today they realized importance of it, mantle is a proof of this. well we will see.