OC 8800gts with nTune or RivaTuner?

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?
 
This is the exact site I downloaded my version from and is the same 2.06.

The other site really gave me a good way to set the fan duty cycle. Although I think I will modify it since they are using a GTX and at 100% my card sounds like it will take off. The OC profile might not be what I want to do though.

Thanks again.