4GB of "Hardware Reserved" RAM and RAM only running at 667 MHz

[quadrplax]

I was looking around in task manager when I noticed some issues:

I have 16GB (4x4GB) of 1866MHz RAM, 2 sticks from Mushkin (997008) and 2 sticks from G.Skill (F3-1866C9D-8GAB). They are each in their own memory channel. This has worked fine in the past when I was using Windows 7. I don't know when these issues started. I did do a clean install of Windows 10. My bios has always only let the ram go to 1333MHz, but now it's half of that. I recently did a memory test and there were no errors. Any idea what's wrong?

 

[Tradesman1]

Sounds like the DRAM doesn't want to play or Win10 isn't picking up on all of it, would start with the GSkill in slots 1-3, go to BIOS, enable XMP and raise the DRAM voltage + 0.05, save, exit, shutdown and then add the other two sticks in slots 2-4