I tried to push my fsb to 425 using GTL 0.66/0.675, 1.24VTT, 1.64PLL, 1.34NB and 1,28vcore. After 59 minutes of prime blend test i got an error on the 2nd core. If i change the voltages a little bit i get errors in 5 minutes Seems that GTL Ref is the reason why i can't find the stability but i don't know how to work with it.