so ive done some testing, since i hit a wall at 3.5ghz i returned to the very basics to see what part could cause the problem and while testing the mb/nb for stability i noticed that increasing the NB voltage had no effect on stability and would always give errors at about the same frequency. even with NB-volt at 1.4 i could not get a higher NB Frequency than 2540mhz(which i can do at stock voltage). so i tried to set the NB-volt to stock and increased the CPU-NB-VID by 0,1v to see if that would let me raise the NB freq. higher, and look there it acctually goes higher.
so either i had/have some wrong understanding of these 2 voltage settings or its a bug in the bios where the values get mixed up...
NB freq at 2700mhz and still increasing to find the max with CPU-NB-VID @ +0.2v
@bart: maybe you are also playing with the wrong voltage
EDIT: 2700mhz was right the limit with +0.2v, with +0.3v it got unstable at 2800mhz... i dont feel like pushing it farther at the moment but i will come back to that later and see how high i can get it stable with +0.4vEdited by kromar - 6/23/09 at 11:13pm