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Hi I'm new here and have a question, How can i overclock the voltage on my XFX HD 6770 1024mb gfx card with msi afterburnner? I already have unlocked the voltage but still cannot adjust it, am i missing something? Also the bios for the card is unmoddified so if i need to do that to enable voltage increase can you point me in the right direction> Also whats the best oc anyone has gotten on this card?