Hi everyone, I'm having trouble with my first build ever and think I may need to replace my motherboard.

Specs:
Maximus VIII Hero mobo
i7-6700k
Cooler Master Hyper 212 Evo
16GB G.SKILL Ripjaws V 2400Mhz (2x8GB F4-2400C15D-16GVS)
MyDigitalSSD BPX 480 GB NVMe SSD
Toshiba P300 1TB HDD
EVGA FTW GTX 1070
EVGA 600W BQ PSU
NZXT S340 case

History:
I used the BIOS flashback button to install the newest version 3101. I was able to initially install Windows 10 successfully, and then installed chipset, LAN, SATA drivers from ASUS, and a graphic cards driver from NVIDIA. During my Ninite installation, I got my first BSOD. After rebooting and getting into windows, more BSODs started occurring with increasing frequency. Eventually, Windows Recovery kicked in and I chose the "Reset" option to re-install the OS. The computer BSOD'd during the reinstall.

Since then, I have only been able to successfully boot into the BIOS/UEFI. Booting into a bootable Windows 10 USB or a Windows 8.1 DVD produces BSODs and restarts. The BSOD error codes vary each time and there's no apparent "common" error.

What I've Tried:
-Flashback to BIOS 2022
-Booting with CPU and RAM only
-Booting with different combinations of my storage devices connected
-Booting with one stick of RAM at a time
-Memtest86: Memtest found errors on the order of hundreds of thousands to millions on each of my RAM sticks. I bought a new set of Patriot DDR4 16GB and tried them with no success. Memtest also found hundreds of thousands of errors on the new RAM.
-Clearing CMOS
-Loosening CPU cooler mounting bracket
-Inspecting CPU socket for bent pins (none)
-Inspecting CPU/mobo for excess thermal paste (none)

Everything still results in BSODs whenever I try to boot into any kind of installation media. Is there anything else I've missed before I start the RMA? Could it be the CPU?