AMD has officially announced Zen 3 architecture Ryzen 5000 series processors on October 8th. The latest Zen 3 processors have significant performance improvements compared to the previous 7 nm Ryzen 3000 series processors. For the upcoming processors, MSI has released the latest AGESA COMBO PI V2 1.1.0.0 for all X570 and B550 series motherboards (Link) to perfectly utilize the PCI-E 4.0 performance.
Regarding the 300 series motherboards, including X370, B350, and A320 chips, AMD’s current official information points out that they are not supported. If AMD makes any official updates later, MSI will also provide the latest information on time.