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I don't need to prove Tom's was wrong there, you can see its wrong, the 320mb GTS would not be faster than the 640mb GTS when both cards are the exact same cards, at the exact same speeds, just one has half the memory.
Look at this review here, 512mb 8800 GT and 256mb 8800 GT, see how when you start slapping AA/AF on, even at 1280x1024, the 256mb gets left behind by the 512mb, thats because it hasn't got enough memory.
http://www.firingsquad.com/hardware/xfx_geforce_8800_gt_256mb_xxx_review/
But what you said that cant happen.Also there both XFX's
Well if the game is not using all that 256mb of ram then the 256mb GT could be faster, dont know why but you see it sometimes like I remember the GTS 320 beating the GTS 640 in some games. And of course if the GT 256mb is clocked higher then it'll win untill the memory becomes the limitation.
But no one wants to be buying 256mb cards these days if they want to play the latest games full wack at 1280x1024+, 512mb is the standard and in not so long it'll be 1GB.