Yeah it's a doozy of a problem haha, I'll have a think and keep an eye on the other thread too. Are there any other areas worth exploring? I had another look inside the kernel but couldn't find any processes or threads behaving obviously unusually.
Yeah, I'm 99% sure that the RAM is compatible, it's rated up to 6000 MT/s and 3000 MHz whereas the motherboard appears to support up to 8000 MT/s and the CPU 5200 MHz. My motherboard appears on the RAM's official QVL and the CPU was used on three of the test platforms of the RAM's AMD EXPO™ Technology Memory Profile Self-Certification Report. Both my RAM and CPU are listed as compatible products when using the support tool on my motherboard's official web page. I'm also not running EXPO at the moment, so my RAM is currently only running at 4800 MT/s and 2400 MHz.