https://bugzilla.kernel.org/show_bug.cgi?id=68571
--- Comment #22 from perry3d@gmail.com --- That's no problem, as long as they are stable :). But i think you are wrong: in the dmesg output the card is set to 930 Mhz (if i read it correctly). And the stock 6870 uses 900Mhz. Maybe the voltage is not adjusted correctly? Whats the effect of an undervolted card?