New Z690-F BIOS came out a week or so ago and it says "Improved DRAM reliability".
An hour of playing around, XMP still doesn't even boot. Manaully adjusting the DRAM settings gets me no further than before, 4800mhz stable. Seems to be pretty common that people are having a bad time with 12th Gen Intel and DDR5. I don't really care to be honest about the extra 1fps that 5600mhz will get me so whatever, but it would be nice to just get what I paid for.
In other news, i've been playing around with GPT-3 and researching it and LAMDA by Google. That is some really cool tech. Excited to see how good it is in 5, 10 years.