at stock its 850/975, i can't get passed 875/975 without hangups or artifacts!! bad card? would higher fan speed help this? there are no voltage adjustments available for these cards as they are non-reference, specifically the ZSFC model. maybe another program besides CCC?
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More aboutoverclock 4890
Yes u can try increasing the fan speed manually... U can try "Riva Tuner"...
by increasing the fan speed this can help prevent lockups or artifacts?