K, measured PSU Voltages, all are ok.

Swapped all sticks out for one stick of another kit, all ok

Put two sticks of the four back in, those are ok.

So Ill see if I can find out if one of the two others is broken or maybe just some incompatibility as usual. That's fixable by simply swapping sticks around among the DIMM slots.

Still Im pissed though.