what happened to HD4890, when it was first tested on tomshw,it can ran a 40+fps at 4AA 1680x1050, crysis. but now, in the review of HD5850, HD4890 dropped to about 30fps under the same condition. i always trust tomshw. and i believe they will never bias anything. but what happened, don't tell me it's because of the plantform, they are likely the same, don't tell me the matter of brand, they can't change the performence of a card for more than 30%, and using different brand is a kind of bias itself. what a am thinking is the damn manufacture, they must half assed it, what do you think