I have a Sapphire HD 4870 right now, and as good as the pure performance is, I am sending it back. I have had a string of nVidia cards since the 7600, and not ONE problem with any of them. My HD 4870 freezes my computer in certain games, forgets settings in the control panel, and sometimes just refuses to let me override FSAA and AF settings, and the fan goes berzerk.
A little googling tells me I am in no way alone, and it seems the ATI power saving thingy is the culprit. Anyway, to fix it I have to flash bios (I am not an engineer) and hack(!) fan settings. No way.
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