Windows 10: Windows suddenly only using half of RAM I installed

Hello,A few months ago I installed a second ram stick which makes it 8gb RAM now 2x4 and like I expected, 6gb was usable. Today - after GTA V warned me that I don't meet ram requirements - I checked and only 3,41GB out of 8GB was usable but Windows still said I have 8GB installed. I cleaned the ram slot, reinstalled it but no, still only half usable. I also checked if the RAM was compatible and if DDR3 was compatible with DDR3L and both answers were yes.Specs:Windows 10 Home 64-BitAMD A6-7310 64 Bit Proccessor4GB DDR3 + 4GB DDR3LRadeon R4 iGPU1TB HDDModel: 260-a160ng HPLooking forward fo

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Windows 10 only using half the installed RAM

Device name DESKTOP-AJD2UQS
Processor AMD Ryzen 7 1800X Eight-Core Processor 4.10 GHz
Installed RAM 64.0 GB (31.9 GB usable)
Device ID
Product ID
System type 64-bit operating system, x64-based processor

Edition Windows 10 Pro
Version 20H2
Installed on ‎2021-‎03-‎15
OS build 19042.631
Experience Windows Feature Experience Pack 120.2212.31.0


My problem is in bold. Windows and the programs in windows can't use all RAM.
I had an older installation of windows 10, version 1909 and it has the same issues as this new install from MS download to a formatted USB drive build version 20H2 on a new SSD.
BIOS shows all 4 sticks of RAM and currently set to XMP profile 1. I've used different BIOS versions and RAM configuration settings with no change, except faster or slower performance.
I've used memtest86 full test (which took ~14 hours to complete!) and zero errors on all 4 sticks of RAM.
CPU-Z detects all RAM with the only difference being two were mfg. 1 week earlier than the other two.
I found some other answers on this and other forums and tried their suggestions to no avail, which include:
The MSConfig -> Boot -> Advanced -> Maximum Memory check box
I've also put all 4 sticks into a gigabyte B550 Aorus Pro with an AMD 3700x with the same result, so it's not the processor, board, or BIOS.
The current system is:
Gigabyte AX-370-Gaming K7 BIOS F4
AMD Ryzen 1800X












- - - Updated - - -

Another post in this forum asked for someone with a similar problem to show a CMD WMIC query.