These 3D chips are real sensitive to vsoc volts. Before on my 5800X I needed a little over 1.1v for 1866, with this new production finer built chip it can do 1900 1v so there's been some changes. I was pushing 1.0875vsoc and was getting some weird instability until I lowered it.
I will have to try memory tweaking. I set my ram to its 3600C16 XMP profile, set fclk to 1800 and soc voltage to auto and it seems to be working fine so far. Not sure if I should push for higher speed at c16 or see if I can improve latency. My 2200G always failed to boot at 3600C16 so that was also an instant improvement.
Spent most of last night playing with mounting and fan profiles because to begin with temps were really high. Took my case apart and took the fans off the radiator to find it caked in dust so cleaning that dropped temps by 5 degrees. Still hot but it is no longer above 85 when running CB r23 so I can live with that.
Might also do more PBO2 tuning, set it to -20 all cores and it did an r23 run no problem, didn't really drop temps much but all core clocks were higher. Since -20 worked fine I will try lower settings to see what it can do.