where to find voltage mod info for Geforce 2 GTS?

Does anyone know of a source of info/directions for doing a voltage mod on a GeForce 2 GTS? Any pointing in the right direction would be much appreciated.

What chipset does your mother board use? If it a Via, (KT133,133A), then I think that the AGP driving value controls the voltage. DA is the "stock" setting, but I've seen people using DE as well. Other than that, I don't know about voltage mods. I've got the same card you do, why are you looking to change the voltage?

I'm using the Intel 815 chipset.

The overclocking I've done so far with the card has been quite disappointing, so I'd like to strap on a larger HSF, try a higher voltage, and see if I can get anything more.