How to set up GTL Ref Values for 45nm & 65nm

[LuckySevn]

ideal nb gtlref for standard Intel values is 0.666x vTT, but there is an extra value for the NB called FSB_SWING which is 0.25x vTT nominal, this is set by the manufacturer and it determines the distance for logical 0 / 1 from gtl ref voltage. it's the swing distance for a switched voltage. It may be that this is based off a divider from the GTLREF NB voltage which has already been reduced by a set of 1% resistors, it would make sense to do something along these lines as too high a vTT would cause too large swing between ground and power, perhaps thats the reason why we use smaller NB GTLREF multipliers or values.

Hi Mike, thank you for all the information thus far, I've finally gained some better understanding on VTT and GTL. All other articles I've come across are either vague or utterly confusing.

So based on what I've read here, my settings should be:

CPU vCore: 1.475v
CPU PLL: 1.58v
CPU GTL Ref: 1 / 1.475 = x0.67
NB: 1.49v
VTT: 1.48v
NB GTL: 0.80 / 1.48 = x0.57

Am I correct? Thanks!