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Nvidia easy.
Ati best single GPU (HD6970) is not going to be faster than the GTX480![]()
I think the 580 will hit the shelves at £450 and be 20% faster than 480 and be quieter
I think 6970 will be released at £350 and will be 95% the performance of 580 and cooler and quieter. I expect 6970 to have double the tesselation power of 5870 but still be comprehensively beaten by Nvidia when tesselation levels are extreme.