I believe that if you flash the card to represent a "evga" you,
should be able to use their volt tool.. I've seen it done with a few other cards of the GTX class...
Riva tool has a way to do it, just gotta google. I don't use Riva tool, so I can't help you there..
There is all ways a hard mod that W1zzard did for
Gforce GTX 285's