Well perhaps it has to do with surprisingly good performance to come so AMD thought they'd brand them a little higher or so they can more easily price them higher (say $499 for a Cayman XT)? $499 for a HD 6870 might look a lot but if you get a 6970 it looks better, for the knowledgable people it's just a number but for people who don't have a clue about the graphics cards it could have a point when comparing to HD 5870 and 5970.
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