When you start raising vcore sometimes the cpu will not to be prime stable over 50C. Are you reading the temp in asus probe or MBM5? Although I don't have this mb anymore, I'm pretty sure that asus probe shows the socket temp. You can configure MBM5 to read from the diode. The diode is more accurate and tends to be 10-15C hotter than the socket reading.
Yes, I'm reading the temps from MBM5, so they should be quite accurate, but I'm surprised to learn that these CPUs don't like anything above 50C...
You will need a better heatsink if you want to overclock more. Also case ventilation makes a big difference because the heatsink is trying to cool a hot cpu with hot air inside the case.
Can you run prime95 without errors at stock speeds?
Well, currently my case is half-opened so I don't think air temp inside is a problem. The board stays around 25 C.
I didn't even try to run Prime95 at stock speed! That's a good think to try first, I'll do just that tonight.
Thanks. If anyone has more help, I'm all ears.
Mr GLR