using an acbel and atrix psu here
oc-ed my celeron d to 3.5Ghz on IC7, using atrix psu....
vcore fluctuate more than the +12v and +5 v

reading for the atrix(using mbm5 updated every sec and have been running for 3 days +)
vcore: 1.42-1.54
vddr:2.77-2.88
+3.3: 3.23-3.55
+12: 11.86-12.16

having the same problem like urs... only sometime i am able to boot on 1st time, usually need to boot 2nd time...