What do you mean show ecc errors? There is a way to collect them outside WHEA ? I am tryng to explore my current build behaviour under a Huananzhi tf8 bios, another “half dead” board with 2678v3 cpu, TBU enabled and bios GHX99_0014 on the boot screen, internal info says X99_15 from 10/28/2019, by lowering CL to 8 on the 32gb samsung DDR3LRDIMMs i got errors showing in WHEA if i don’t cool them with a fan after approx 3hrs of tm5 - shown as memory controller errors.
I still have not flashed your bios on this same build but will soon