Don't know if this has any bearing or not.

Voltage readings from bios.

ATX +12v (24 pin) 12.31v
ATX +12v (8 Pin) 12.37-43v
ATX +5v 5.2v
ATX +3.3v 3.39v
ATX 5vsb 5.11v

Note: I did take the measure of wiring all but 2 small fans to fan controllers on separate sources to cut down on the draw from the motherboard.

RLM