*Official Retail G0 Q6600 Overclocking Thread*

[Pacha]

Unless you madely overclock your memory, you use +4Gb RAM or your FSB is above 450MHz, usually, you won't need to increase vNB

Those voltages on the NB are clearly not appropriate for only the CPU
Also, at those frequencies, VTT above 1.30v won't help you as you noted

Many people still bump crazy voltages every where when they don't know what to do or what's holding them.
In your case, it is clearly the vcore limiting you. These L8x steppings act like B3 and early G0 chips. For a Q6600, I won't hesitate bumping 1.53v + loadline calibration if your temperature permits it. Intel specs are 1.50v, so with 10% margin on 65nm chips you can go to 1.65v. Usually, you'll be limited to 1.53-1.55 with heat

I never heard of any Kentsfield reported deaths at those voltages and I ran my B3 at 1.53v for few months too at 3.6GHz

edit: I noted you have a commando, it is a very bad overclocker of quadcores and stability near and above 400FSB is a random dream

I agree. But temps finally raise up if I set too much voltage and I'm not even sure I'll reach 3.5 with a lot of vcore, as adding 0.05V directly doesn't give me any more second of stability at 3.4.
I must say that I forgot my Commando is a very bad board for quad, but seeing the others' results, mine are a mix of Commando's limitation and the poor CPU overclocking qualities. If I buy a P35 mobo or such I'll certainly be limited at 3.4 like others, and I'm not going to buy a new CPU and a new mobo right now. I'll wait a bit for that; quite disappointing anyway.