Voltages - good point. Thx for the test point info, rather shocking and explains why my temps got so high when I was pushing it - I'd have never gone so far on stock HSF if I'd known.

Here are some vcore samples:

bios 1.4375 (1.2375 + 0.2)
aibooster meter 1.46
dmm 1.47

bios 1.4375
aib 1.49
dmm 1.50

bios 1.45
aib 1.50
dmm 1.515

So adding 0.01 to the software reading is about right - and miles away from the bios.

I've only done one check on vdimm:

bios 2.80
aib 2.85
dmm 2.81

which is closer to the setting than the reading.