Coolbits must be installed for the clock frenquency things. Just double-click on the exe, and choose OK. Then go to nVidia display and you have new options.
One MAJOR MAJOR thing....many of the newer nVidia cards, such as my 6600, can't use Coolbits to detect optimal frequencies.
To overclock yourself:
1. Up the clock speed on both memory and core 10mhz. Then run Aquamark 3, or an equivlant benchmark. If it runs, game on it for a couple of hours, to stress test it.
2. Repeat until the benchmark is unstable or your games crash - whichever is first. Then, put it down 5mhz, and repeat the test, if not, put it down another 5mhz (to your last stable test), and you've overclocked your graphics card.
3. Don't forget to watch your temperatures!
Again, I take no responsibility for damage or harm, etc done to your PC. It's YOUR choice, risk and responsibility, NOT mine!