3
RAM issues.
(wirebase.org)
Your motherboard or CPU might not support it if it's old or proprietary
....Usually the case. I concur. ๐โโฌ
Did you check your mobo manual and make sure your RAM is in the right slots?
What devices do you have in pci lanes? This is an addressing issue. Do you have an igpu with bios settings sharing ram?
I've got a 1070ti ftw2 and a wifi card but I wouldn't think either would share the ram.