Originally Posted by
jonny_ftm
You're right, after all, the +12v rails amperage limit is only theorical, as 99.99% of the PSUs seems "forgotting" the power protection if one of the +12v rails exceeds the 18-20A limit fixed by intel. So, as many claims, it is the combined +12v Amperage that should play a role instead of the +12v limit per rail (18-20A officially to respect intel specifications).
In most calculators, a Q6600 G0 at 3.8GHz and 1.6 vcore can drain near 250W and 20-23A. If the PSU respects the combined +12v amperage "lease", the PWM would be the limiting factor.
If the CPU, after asking for about 20A will overload the 8 PWM feeding it, they'll enter a protection phase (EPU) thus limiting the current going to the CPU. At least, this is the most logical theory. In that case, only a PCB revision would solve it, with stronger PWM components