I have the HR03 Thermalright cooler, and great case airflow. My card came company overclocked. Pny 8800Gtx OC. 621/1000 i think. I have been able to reach 633/1066 via ATI Tuner. Any higher and my screen automatically locks up. Is there a way to continue to push my GPU? or is this the limit. Can you increase voltage to the PCI E ? Maybe I should be using a different Overclok Utility...? I am pretty sure I can reach higher clocks, espescially with such a nice cooler....keeps my Card Idle at about 45 and at load it never gets past 60-65C Any help would be appreciated...It should be known that If iI cant get it any higher...I will be able to live, It's not a huge deal, Just want to see If i can push it more. Thanks!

uhm...

running 633 now right?stable, i would recomend u to try 648/1063 effective clock. dont force the memmory to much, 1063 is good increase, the core n shader to 648, an see how much performance gain u have.

I'm not sure how to set the 'shader' clock unless I flash my cards BIOS which I do NOT want to do. Anything above 1066 mem fails. same with the core clock. Am i finished ? no more OC for me?