Can't answer that one, never wanted to bump voltages cos temps were high enough already.
All shader overclocks seem to have a temp limit...I can run 1620 if ambient is below about 10deg but must drop to 1566 up to maybe 23 then above that 1512. Your watercooling should improve matters once you find the level to start
Edit: I'm still running 190.62 on the 260's ...I think it is 182.xx on the gx2's and I tried 195 on the 98gtx last week ....all seemed to work
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