I am having a bit of a nightmare with my shiney new 12700K and DDR5 build as I just can't find any stability. My components are listed in my profile, but I am pretty sure my issues centers around stability of my DDR5.
I didn't try clearing the CMOS, but have fully powered down the motherboard and had it do a longer bootup, which I assume is it rerunning its memory training.
I am also waiting on a new BIOS version and have my fingers crossed. This forum has been really helpful cause initially, when I was getting Memtest errors and it crashing all the time I was starting to consider RMA'ing my DDR5 cause I assumed the latest BIOS (v803) would be the most stable.
With hindsight I should of realised early adopting a new memory technology would lead to a reasonable period of BIOS issues and instability. I'm hoping over the next couple of BIOS releases things will improve significantly.
I'm still tempted to give the newer BIOS (v803) another go and manually set the voltages I've been closest to some stability with.