Greetings!

I'm trying to tweak the GTL values on my DFI DK P45+, but I'm not sure about some things.
Is GTL 1/3 really used when you're dealing with a dual core?
I was looking in the bios and I have a wide range of settings for the 0/2, but only 4 settings for the 1/3 : 0.67,0.63,0.61,0.58.
And also for the NB, just 4 values.

So, how do I set these GTLs? I know that the voltage should be around 0.8 - 1V, so for a 1.3V nb voltage I should use a 0.61 gtl.
What about the CPU?
I'm going to calculate that according to the VTT, right? What about the FSB Vref? I leave that to 2A.

So, the only settings I should alter are the GTL 0/2, the GTL for the nb and the fsb vref, right?

Thanks!