***Having trouble with C5 errors??***
Try setting a 3000C16 memory speed setting... It might help(?) with the issue until a new BIOS fixes the bug.
I'm running on a CH6E with a 3900X and a GSkill FlareX 3200C14 kit and I didn't experience the bug until yesterday when I tried to boot at DDR4-3800 memory speed which caused a C5 error.
My combo will run 4.2GHz all core at 3200C14/3600C16/3733C16 1:1 with BIOS presets saved but a cold boots will trip the C5 error while hot boots don't. I normally run my rig 24/7 with performance power plan so I hadn't done any cold boots over the last several days/week.
I also have two auto overclock BIOS presets... PBO3200C14 and PBO3000C14 both of which will trip a C5 error on a cold boot while hot boots work.
For my combo I saved two additional overclock presets... A 4.2GHz all core 3000C16 and a PBO3000C16 which do not seem to trip a C5 error upon cold booting!
Any time I get a C5 error I push the clear CMOS button with the power on and boot to BIOS defaults and then load one of the 3000C16 presets after which I can then hot boot to my other faster memory speed presets.
If I'm going to shut down my pc... I hot boot back to one of the 3000C16 presets so that I don't get another C5 error when I re-start my computer.
Hopefully this might work/help with some of the other Crosshair VI versions and Ryzen 3000 combos out there?
So far with my combo when attempting to run at DDR4-3800 even with 2:1 ratio it will still trip a C5 error.
I'm looking forward to new BIOS updates!!