YAY! 1933FCLK works again in F31h Bios, might have done also on F31g if I put the same settings there.
Key settings are VDDG_IOD 1100-1150mv & LN2 mode + 1.200VSOC.
VDDG_CCD, somewhere in the 950-1000mv should do.
EDIT: Audio issues, need to tune voltages.
Audio issues you say??....dont suppose you were like me and got forced onto windows 20h2 2009?
Nothing but dpc latency problems for me since booting up a fresh 20h2 install. Spread spectrum and hpet tinkering in BIOS as well as dynamic tick and platform clock tweaks in OS helped....never eliminated it though.
I really should just copy what ive said in the last 3 threads regarding ryzen audio but....
I disabled hpet and spread in bios along with c-states, audio issues were less frequent. I used latencymon and saw gpu was spiking hard with dpc (5ms) and audio crackling.
Applied disabled dynamic tick and all that jazz. Unplugged my sound blaster after enabling 10-bit tag and tbt (hope tbt is also 10 bit tag lol) and rebooted. Went back in and disabled those again and shut down. Installed sound card again and booted up...no crackles!
However the 2080ti and asus rog theta headset were still have issues (sound card is for my yamaha exclusively).
It seem the windows timer is always stuck at qpc 10 and never drops down no matter the tweak. I even tried InSpectre to remove the spectre mitigation to see....nope, just 4fps more in benches.
Whatever seudo voodoo bs MS have done in the new update is messing with drivers and its causing ppl to think its their hardware.
If you cant bear waiting for a fix from MS or cant find stability, You can get RUFUS which is the only current way i know how to get a bootable ISO for each version of win10. Even the 1909 media creator forces you to visit ms and get 20h2 media creator.
I have my new pro cd key and plan to disable via group policy the ability to update and set business update to 1909 static.
Hopefully I can report back here with success tomorrow after i wake up.
Note: ten bit tag is needed for pcie 4 IIRC, so if you have 6000 radeon or 3000 rtx dont touch it, just pray lol.
I set 970 Pro (disk0) in a single volume on its own (and pair disk1 and disk2 970 Pros for RAID0 through X570 chipset) since it is directly connected to CPU so that I could avoid latency disparity between direct connection and through X570 connection. 
