I think I must've gotten lucky, after a motherboard upgrade (I went from the B450 Tomahawk Max to an X570 ASUS ROG Crosshair VIII Hero), I was still experiencing the same issues. At some point while tweaking my system, I had to clear CMOS, and miraculously it restored my CPU to functioning within spec! Unfortunately that means that I don't consider my above response to be a proper solution (more like a temporary workaround). I would recommend taking a look and seeing if you can do a CMOS clear on your board, and maybe that'll work for you.