Thanks for the test data Achim

I haven't tested much... only started it up now
Still booting 2.8G fine though at least - better than my 9500/9600 ever did without problems

Yep, your board is using 8-pin 12V connector (black), with that PSU, first 4-pin is 12V1 and the +4-pin is 12V2
The MB connector as well as most peripherals are 12V4/5V/3.3V.
12V3 is PCIe 6-pin.