Hi. My Crosshair viii hero x570 manual states everything over 2666 mhz is OC'ing. I use the qvl listed G.Skill Trident Z Neo (F43600C16Q-32GTZNC). On boot my BIOS registers it at 2133 Mhz and it runs OK. I did have a problem setting 3600 Mhz in the BIOS. The system hung up with a F9 Qcode. I have been working with The ASUS group with this. Good people. My PC is running great now on 2133 and I do intend to bump it up to something stable. Actually before I reset the CMOS, for another reason, the BIOS set the DDR4 at 2133, I then set the memory at 3600 and the BIOS changed it to 3573 Mhz and the PC was running great.
Not supposed to but I guess every mobo can behave differently. Good luck.