Originally Posted by
CryptiK
I know, and have briefly explained how, to set the GTL Ref's on this board. Depending on how each core of your CPU behaves, you need to tweak them yourself accordingly, after setting the standard values, which as I said earlier, are 0.635x Vtt for 45nm CPU's.
This means you need to adjust GTL Ref 1 & 3 (0.667x) to a negative mv value (which you work out by using the equation or second, easier method I gave based on your Vtt) and leave the GTL Ref 0 & 2 (0.635x) alone so all the GTL Ref values are as close to the same as you can get them.
From that point you need to tweak for your individual CPU, GTL's are a not a 'set this number and you're done' setting.