So which one should I be OCing with? I tried the Riva Tuner but for some reason my OCed actually went down in 3Dmark performance. Stock is 650, and I tried 680 and 690. Both performing lower. I actually set the clock to stock in RivaTuner and it performed lower. I uninstalled and it was back to the average around 19,100. I OCed with ntune only to 680 and it went up a bit. What gives? What am I doing wrong?