UPDATE: I did a test on another board and ran into the same issue with not being able to boot into Windows on default settings, on a newly flashed BIOS that I had not used before.

As with my original board I got blue screens with thread exceptions and the like happening.

After making the changes I outlined in the original post is when I could boot to desktop and everything was working, just at high voltage and consequently high temps.

I’m talking to Intel support now as I guess as some comments have pointed out, the CPU is very likely defective 😞

Yeah this I’ve seen said before. I have thought to do that as a better way to keep track of changes and what causes an issue and what doesn’t.

Except I kinda have this issue either way, but yeah I’ll probably do so for the added safety. Though it does suck, as far as features go, you’d hope it’d just work.

MCE is enabled, I even tried it off and this morning I actually did a CMOS clear again after the replies here just to be sure it’s not a bug in software.

With MCE on and MCE off with everything at auto I can’t get into Windows. The BIOS voltage readout was at around 1.42.
Which from the comments yesterday is about normal and what’s expected.

I then made the changes back to what I had as stable (1.5+) and I can boot into Windows at least.

It’s really weird and I also feel like for my setup I shouldn’t get a ton of throttling, but on heavy workloads it will frequently go down to 5GHz or 4.9GHz and stay there.