After reading on the net about my card I have noted that the clock speeds are:
Core: 500MHz (seems a little high for a 6600GT)
Memory: 1000MHz
After downloading RivaTuner it reported my Memory Clockspeed at 1000MHz but my core clockspeed at only 300MHz.
Why is this?
Okay, after checking out RivaTuner it turns out there are 3 different settings
Standard 2D Clock = 300/500
Low Power 3D Clock = 500/500
Performance 3D Clock = 500/500
So that setting was the Standard 2D Clock...
Okay i've got my card running at 600/1200 and i tested quickly with the nVidia test thing, now I'm going to run 3DMark2001 to see if it's okay, i'm still scoring under 10,000 though.
Nice Overclock.
I have an XFX 6800 GT 256 meg :) running at 415/1130. I'm getting good benchies: 3dmark '05 - 5404 Aquamark - 41,916. I also softmodded it to an Ultra using RivaTuner which increased my scores a bit because of the increased voltage.