3900x RAM & memory controller OC

[DaveB]

Because even 3600/1800 speeds don't train properly.

So if you reset the CMOS, load the default settings, reboot and then select the XMP setting for DDR4-3600 it doesn't work?

 

[Johan45]

So if you reset the CMOS, load the default settings, reboot and then select the XMP setting for DDR4-3600 it doesn't work?

That's what got us this far but the OP is still having issues at start up