Half RAM allocated to "Hardware Reserve"

Hello everyone. I really hope you can help me. I'm at the end of my rope.

First off, my specs:
Gigabyte 990FXA-UD3 mobo
AMD FX 8350 CPU
2 x G skill 4 GB sticks
EVGA 660 Ti GPU
OS on SSD
2 x 1 TB mechanical drives

Only half my RAM is showing as usable. The rest is shoved into hardware reserved. It doesn't matter what channels I use or even what RAM I use, it cuts whatever is in there by HALF. I even tried 4 sticks, cuts 16GB into 8GB.

I've tried CLEAN installs of Windows 10 AND 8.1, still cuts in half.

I've send mobo back to gigabyte, they tested and found no problem.

I tried a different CPU, still cut in half.

I tried different GPU, still RAM halved.

I've tried editing registry, unchecking that box for "maximum memory" in the msconfig boot menu. I've looked all through the BIOS and tweeked different settings. Nothing.

I'm hoping someone can help. I don't know what else to do here.

Included are screenshots.

Try checking some BIOS options (memory hole and the such). You might want to upgrade BIOS if possible (but check the manufacturer's site first for a changelog).

I saw this snippet: change the BIOS setting for Frame Buffer Location from [Above 4G] to [Below 4G}... and now i have 1MB in HW reserved and not 4G. Windows sees all *G as usable

Try checking some BIOS options (memory hole and the such). You might want to upgrade BIOS if possible (but check the manufacturer's site first for a changelog).

BIOS is updated to latest version and I triple checked all my other drivers to make sure they are up to date.

I saw this snippet: change the BIOS setting for Frame Buffer Location from [Above 4G] to [Below 4G}... and now i have 1MB in HW reserved and not 4G. Windows sees all *G as usable

I have not seen this before and is not something I've tried, I will try this when I get home.

I saw this snippet: change the BIOS setting for Frame Buffer Location from [Above 4G] to [Below 4G}... and now i have 1MB in HW reserved and not 4G. Windows sees all *G as usable

Alright no good, I don't see anywhere in the BIOS where I can change this value. I've looked everywhere and also google searched, got nothing.

Update I tried another OS on another hard drive, same thing.

Have you checked the memory modules individually by taking both out, insert one at a time in both sockets, switch them around and see how they behave, make sure they don't have any bent pins and inserted fully.

Have you checked the memory modules individually by taking both out, insert one at a time in both sockets, switch them around and see how they behave, make sure they don't have any bent pins and inserted fully.

Yes, I've even tried different RAM sticks and bought brand new ones.

I have almost same configuration and this is what it looks like here:

May be important that I'm using BIOS, not UEFI.