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If it starts perfoming badly on those BIOS then definitely RMA it. Does it clock the same on the different BIOS?
Probably has a better fan profile or something or uses less voltage.
Yeah why not add me on origin - Spenty


Speak to humbug - he's done a lot of testing on the 7870 with overclocking and performance scaling. He may be able to give you even more information than what has already been given by LtMatt.