Prolly volts. You have a good card. Most of my cards do 1.25 for about 1100/1300 depending on the hieght of the cpu clocks. I did find that if you ramp up you cpu significantly, u need more voltage than 1.25 for the cards. I've talked to peeps that run 1.28 on cool air for 1000/1300.
Lets not forget what I call the "ATI Freak Out" at high cpu clocks.
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