against my better judgement here you go:
http://forums.guru3d.com/showthread.php?t=247576
that should be the link to volt mod
same as 8800gt
with that said
I DONT RECOMMEND IT
there is a bios flash link if you read the posts in that link that will bump volts
Honestly the extra performance you get with the volt mod will NOT
be significant in real world performance
But if you want to do if for the challenge and info gained and
are willing to RISK your card
than go for it
Heck I wrote on the back of my CPU with a circuit writing pen to
overclock mine LOL