MSI Confirms AMD Ryzen 4000 'Zen 3' Support On 400-Series Boards
ASRock > B450 Pro4 R2.0
AMD Zen 3, Ryzen 4000-series CPUs will work on B450, X470 motherboards | ThinkComputers.org
BIOSTAR - The B450 series motherboards that continue to sell well. Biostar motherboards support the latest AMD Ryzen 5000 series processors and are backward compatible with AMD Ryzen 4000, 3000, 2000 and
AMD pivots: B450, X470 motherboards will support Ryzen 4000 after all | PCWorld
AMD's Ryzen 4000 and Q3 2020-bound desktop processors confirmed to support the AM4 socket and B450 chipset - NotebookCheck.net News
Amazon.com: ASUS ROG Strix B450-F Gaming II AMD AM4 (Ryzen 5000, 3rd Gen Ryzen ATX Gaming Motherboard (8+4 Power Stages, HDMI 2.0b/DP,2 x PCIe 3.0 x16, USB 3.2 Gen 2 Type-C, BIOS