BTW: I already ordered the XFX model above. Should arrive by Saturday.
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More aboutradeon 6850 6870 bios flash
Are you sure it was those cards? I know you can do it with launch 6950s to 6970s, but I haven't heard anything about 68xx. I wouldn't do it in bios with those because if the card can't do those speeds you'll have issues.
the cards your thinking of are 6950 and 6970. the 6850 can be bios flashed to 6870 but it doesnt unlock any shaders, just increases clock rates and maybe voltage depending on the model. http://hardforum.com/showthread.php?t=1562148