Windows 10: Windows 10 only using half the installed RAM

Device nameDESKTOP-AJD2UQS
ProcessorAMD Ryzen 7 1800X Eight-Core Processor 4.10 GHz
Installed RAM64.0 GB (31.9 GB usable)
Device ID
Product ID
System type64-bit operating system, x64-based processor

EditionWindows 10 Pro
Version20H2
Installed on‎2021-‎03-‎15
OS build19042.631
ExperienceWindows 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.






:)

 

windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx

 

Is it time for Windows 10 already?

Here's a good step by step guide on doing a fresh install.

How to clean install Windows 10 from a USB drive - Software - Feature - HEXUS.net

 

Installing Windows 10 on New PC?

I'm going to be building a new PC on Christmas and want to install Windows 10 on it. I have Windows 10 on my current PC, which I installed upgrading from 8.1 with the files on a USB. How do I go about installing a clean copy of Windows 10 on this new PC? I think I recall something about installing it once makes Microsoft recognize your hardware, but since this will be a PC I'm not sure what steps I need to take. Do I need to go 8.1 -> 10 or is there a method of going directly to 10?