New
#471
Look into the B550s going to be good. I wanted the Crosshair VIII or x570 Strix E but was out of stock. Almost went with the Tuf, but I got the itch for a ROG
X570 MBs will support 4000 Ryzen for sure, most b450/x470 are probably getting support, it's up to MB manufacturers to develop BIOS version, 300 chipset series very unlikely.
There are new Ryzen also coming as a refresh to top few CPUs and will have suffix XT and those are just improved old X suffix CPUs. 100-200MHz above old counterparts and improved IMC controllers. Those will be compatible with all present MBs.
Speaking of BIOS, trying this Beta one
ROG Crosshair VII overclocking thread - Page 1151 - Overclock.net - An Overclocking Community
Playing with the per CCX OC now. Trying 4375
AMD Ryzen 9 3900X @ 4373.98 MHz - CPU-Z VALIDATOR