That isn't what I answered to. You said:
"
It might be that I'll have to revert to an older BIOS in order to change the NB multi to something lower, just to find out if it was NB causing the problems or what."
And to that I said use Bar_Edit and you can find out very easily by dropping the multi.

Takes less than 10 seconds to change it and then to reboot, the reboot time and you'll have a lower multi to see if that hinders you or otherwise.
When you say NB, what do you mean, CPU-NB or MB-NB?
MB NB is 1.10v
HT 1.20v
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