Quote Originally Posted by dejanh View Post
Um, I think you got something mixed up here...

25x160MHz = 4.0GHz
25x167MHz = 4.175GHz

That's 175MHz difference between the two. Up your core voltage to about 1.40V and try from there...no need to increase QPI/DRAM voltage. Chances are however that unless you have a very good chip (i.e., one of the golden ones that run low volts and high clocks) you will most likely need about 1.46V - 1.47V at that clock though.
Oh, sorry, I simply mistyped. I meant 24x167Mhz=4008Ghz. That's why I think I should be able to keep the vcore I'm using for 25x160 (1.34375V). The cpu frequency is the same, but I have difficulties raising the BCLK from 160 to 167.