Windows not using >12.5GB of installed 2x8GB

[Keystone Nyan Cat]

Problem:

Windows won't use more than 12.5GBish of my 16GB memory, chrome force quits tabs, applications force-close, and Windows gives me the running out of memory message when exceeding 12.5GB of usage despite having about 3.5GB more left to use.

 

Relevant Specs:

Windows 10 Pro 64bit

AMD RYZEN 7 1700 8-Core 3.0 GHz (3.7 GHz Turbo)

ASRock Fatal1ty AB350 Gaming-ITX/ac AM4

CORSAIR Vengeance 16GB (2x8GB) DDR4 3000 (PC4 24000) CMK16GX4M2B3000C15

EVGA GTX 1080 Founders Edition

 

Things tried:

Running memtest for 36 hours, it hasn't reported any errors.

[orbitalbuzzsaw]

Try reseating your memory

[Keystone Nyan Cat]

3 minutes ago, orbitalbuzzsaw said:

Try reseating your memory

The system is detecting 16GB of RAM and memtest is able to access all of it too (correct me if I'm wrong, but I don't think it'd be able to pass the test multiple times if it didn't). It seems more like Windows 10 being Windows 10, but I'll give it a shot and report back if reseating the memory fixes it.

[TheGlenlivet]

win/R

msconfig

Boot 

highlight your OS and hit advanced options

Uncheck maximum memory if it is checked.

 

[Keystone Nyan Cat]

On 7/17/2018 at 10:18 AM, TheGlenlivet said:

win/R

msconfig

Boot 

highlight your OS and hit advanced options

Uncheck maximum memory if it is checked.

 

 

On 7/17/2018 at 10:10 AM, orbitalbuzzsaw said:

Try reseating your memory

Thanks for your suggestions; I've tried the both of them- but the issue still persists. I've managed to isolate this to a problem within Windows by using three computers that are available to me- two of them with 8GB of RAM start behaving weirdly, force-closing programs and blackscreening Chroma tabs at 6GB; the 16GB one does so at 12.5-13GB.

 

Edit- I've realized its because total physical memory =/= installed memory; I'm looking into ways to fix this and will update this post if I manage to fix it; if you have an idea before I do so though- please post away!