Finally the AX1200 arrived, and I could squeezed it in that little case too It is the same size as the good old HX1000 tho.

E-LEET is reporting the 12v line as 12.26v at idle and 12.18v under Prime load for AX1200. But it stayed stable under the whole short Prime-run that I've tried. 5v is staying at 4.96v.
I've been getting 12.11v for both idle and load with HX1000, but it could drop to 12.05 sometimes.

AX1200 at top, and and HX1000 under, at idle, both with optional 6-pin CPU-connections connected:


I have to test more to see how stable the lines are, but it is running quiet and seams to be doing good so far. So far so good.