Padovan, having the same issue. I would appreciate what you find as a conclusion. I will continue to search and let you know what I find.
Dang knew I forgot something...
It was a bit of a silly one actually.
The issue was with the Noctua NH D14. It sat over the first two ram slots. I followed the instructions given, and it said to install the cooler before putting ram in. I partially installed, and made sure there was enough clearance (all 2mm of it), and then eased the ram into place. Problem was in being so gentle, I didn't seat that first stick of ram properly. Had a face palm moment when I removed the cooler and discovered it.