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I have a reference xfx 7970 and power color 7970 in crossfire, i had to re format my cmputer to get my ssd`s in the pc and when i went back to overclock the cards they wont stay at the higher settings.

i have read everywhere that with these cards you should be able to get the sliders in afterburner to 1125/1575 withouth touching viltages and power limit but when i do, and load a game or heaven benchmark it just dies.

my question is, should i touch the voltage? if so what would be the highest i should go, stock it says 1112mV.

The build of my pc should be listed below.

thanks in advance