Alot of people use Coolbits which is a file that you just double click on and it adds a string to the registry that unlocks the ability to overclock in the nVidia driver properties but i didn't like it all that much because it s picky about how far it will let you overclock.
Most people use Rivatuner. I like it alot. And here is a guide on how to overclock using RivaTuner.
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