Quote Originally Posted by CryptiK View Post
I dont know if 2 cards makes much difference really, I was using 2 x GTX285's for quite awhile and didnt have to change anything compared to one of them or the GTX295 I use now. Always same vIOH (1.13v BIOS giving 1.11v real) and stock PCI-E voltage, only things I ever increased were Vtt and Vcore and I had 4500 MHz stable.
it all depends how good ioh is

my first rexII handlin 5970+5870 on stock ioh voltage @ 4.5ghz

my second needed 1.14 on ioh
my p6t7 ws supercomputer needs 1.2v with 2 285s
my rexIII needed 1.27v for 5970+5870