That PSU should have enough power for your system, unless it's getting old and/or failing. Your 12v rail is low however, at 11.82v. If you can borrow one from a mate to test with it wouldn't hurt to rule it out. Upping the vNB though isn't going to really pull much more power, it's more the cpu pulling the most power. At a low cpu clock, can you run higher vNB without problems?
Do you mean being unplugged from the power point or just a normal cold boot? I haven't noticed this from either situation but I use the 9x multi 24/7.
Definitely lower you vPLL to 1.50v to start with, and try to stay below 1.6v no matter what. Also you may either need more vdimm (depends on your ram) or more vcore and vNB.
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