FYI on AGESA 184.108.40.206 on ASROCK AB 350 Pro 4:
I was running my G.Skill F4-3000C14-16GVK x2 (32 GB Double sided) at 2667 Mhz on XMP profile stable with AGESA 220.127.116.11 2 1/2 months since the build which was great. I updated the bios to 18.104.22.168 the Friday it was release and it won't go at 2800 or 2933 Mhz on the XMP settings. I assumed that it is since having a 2 double sided 16 GB is capped to run at 2666 Mhz as the limit. I gave it another try this late afternoon and it boot without any fuzz or timing modification form the XMP profile at 3066 Mhz. Now it is running at rated speed beyondd the 2666 mhz restriction to AMD team.