Well, the thing is gtx560's normally come with 1gb vram, 570's with 1280gb vram.
I just had a quick look around and as I said the only manufacturer to make 2gb models of the 560 and 570 is EVGA and they have one model for each.
580's normally come with 2gb of vram, but there are a couple more brands that offer a 3gb model of the 580.
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