Is it possible my new 5950x system hardware has already degraded?

[Joxeon]

Try upping the SoC voltage to 1.1-1.15

 

[Troezar]

I'd be running one stick of RAM and update BIOS, the chipset the OS and GPU drivers to the latest stable versions. Then do some testing. That's a lot of RAM on a consumer grade motherboard, albeit an expensive one that should work with 64GB but don't assume it