2900XT was slower than G80 but was priced very good, about 8800GTS 640mb I believe, and was a good alternative to it in a number of ways.
GTX 480 might be the "fastest single GPU", but it's by no means the fastest card. It's just a (good) alternative to the 2nd fastest card, like 2900XT was.
There'll definitely be a dual GPU version but how, without a die shrink, I can't understand. It looks like even a B1 revision (which won't happen, according to some people) and increased yields won't allow a <300w dual Fermi. Maybe they'll scratch the 300w limit. Heck, it looks like they've gone over it with the 480 sp single GPU version!
R600 sucked but the architecture proved to be upwards scalable. It appears that Fermi design is downwards scalable (=GF104 and 108 coming), so by logic it should also be upwards scalable

And that should make some great chips after node shrinks.
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