Well, VTT is at 1.31v. I have gone higher with my other CPU's - like my G0 Q6600 - but i read somewhere that its not a good idea to put too much VTT through these chips, so i was a bit hesitant.

I have been working with GTL's around 85/85/85 which is 66% of VTT. NB chipset has been up to 1.55v, i have a fan on it, so temps are ok but imo it shouldnt really need higher than that for just 200mhz more. (at 4ghz i use 1.47v nb)

I'll play around with the PLL voltage and see if that makes any difference as i havnt tried that yet.