I was basing my estimates on a full 512 shader gpu at rumored target clocks. If GTX480 is indeed cut down or with significantly lower clocks then I'd estimate even lower. As for beating a 5970, you can believe that if you like but I doubt it. Even Nvidia's estimates, with full shaders and target clocks, was 40% faster then 5870. That's not enough to match 5970.
About the whole dual GPU vs single GPU thing, that's your preference not mine. Don't project your preferences on the whole gpu buying community. Thanks.
I was estimating based on a full shader card. Less shaders would equal lower estimates.






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