Hard-modding w/ Variable resistors

[StealthyFish]

Has anyone ever hard-modded their graphics cards using variable resistors? If you have, please post your experience and graphic card that this was done to. I'm trying to determine whether I should do this to both of my 6800GS's and both 7600GT's. Would it be worth it? And what is the level of difficulty of the project? Also, what materials would I need?

Thanks.

Also, on a separate note. I have 2 6800GS's right now, each with different cores. When I run them in SLI, will I have performance problems? I only score 8500 on 3dmark05 in SLI with the bridge and all. My friend scores 13k with his 7600GT SLI minus the bridge. Very weird. Each card can do around 6000 at stock, but one has an NV41, and the other has an NV42

 

[SoCalDJ]

I've hard-modded a 9800pro eons ago with a variable resistor. It was pretty crazy. The great thing about the variable is you can still play with the voltages, giving you more or less, depending on what you'd need. Just make sure you're going to cool these with some sort of aftermarket cooling. You can add a ton of voltage, but if you can't keep them cool then it's useless as they'll just be unstable, overheat, and even damage themselves.

As for what you'd need, I think you just need a soldering iron, some solder, and the resistors. Do some research and you'll find some guides for almost any card out there. They should tell you exactly what to expect and what's needed.