There's either something major wrong with your board, or your multimeter is giving in. A Vdroop of 200mV isn't really within the normal range.
Definitely something majorly wrong with the board. It's not working anymore. (I shouldn't laugh)

It's the way the vdroop increased over time that was a little odd. I don't understand the ins and outs, you've seem to have a better idea than me, but obviously something had packed in.

Temps were fine. Cpu under water. Fans over the Northbridge and pwm area, aircon on, nothing out of the ordinary in SMG.

That's all by the by now. All packed up now, and ready to return.

RLM