depends on the chip, everythings different, my 720 BE only maxes out at 3.48 ghz, and even with increased voltage i cant hit 3.5ghz+
I managed to boot it into 4.xx Ghz today but it keeps failing, I have a feeling it's the HT link, this MOBO is broken, it lets you supposedly change it to 2000 Mhz but when you boot it it goes straight up to whatever the CPU/NB is.
Temps are never more than 50 C so it's not that and memory is set to factory specs so it's not that. Things irritating me.