Memory Problem on Asrock X399

[alsebka]

Hi everyone.

 

I'm having some problems with my memory.

All 32Gb are recognized. (4x8) In the UEFI and CPU-Z the memory is only shown as single channel, although 4 Sticks are installed.
CPU-Z under "SPD" shows me Information for all the Sticks except for the last one. See screenshot attached. 

 

System Specs:

Asrock X399 Professional Gaming

AMD 1950X Threadripper

G-SKill Trident Z 4x 8 GB DDR4 Quad-Channel Kit 3600Mbhz

 

The System is running okayish. With heavy CPU work like 3D rendering etc i have not encoutered any problems. Photoshop on the other hand is acting weird. It won't open some files because of some RAM error. Other files are read without any problem... 

 

What i have tried so far:

• Switching the memory around.
• Testing for dual-channel (did not work) - still single channel
• Testing on A1,B1,C1,D1 instead of A2,B2,C2,D2
• Loosening the screws a bit since i heard the CPU might be squeezed too tightly
• Reseated the CPU

All without any difference. 
 

Any ideas? 

Thanks!