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Hello OCN Community! I have an HIS 7770 GHz Edition card and I already OC'd the card to 1020 clock and mem speed to 1140. I am wondering if I can overclock more, and if so, what is a safe OC for it.

Thanks
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It is safe to O/C if you are smart. Look for your MAx Volt then from there see max GPU Offset then Mem offset. Keep it going up until you see artifacts / fail then scale down.
 

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My old xfx 7770 topped out at 1150 / 1300. There is no voltage control on these as far as I know. But I did have to raise power limit to +20% for it to run stable.
 
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