I'm still a bit confused on all of this, but from what I get from everything here's how I set mine:

FSB Voltage: 1.50v
Processor: Q6700
Motherboard: Evga 750i FTW

Equation:

1.50v x 0.667=1.50 x 0.635 + Y
1.001v=0.953v + Y
Y = 1.001v - 0.953v
Y = 0.048v
Y = 48mv

From this, I set all GTL Ref's to the closest number to 48mv, which was 50mv for my board. Presuming I did the math correct, is this right?