These AMD 400 and 500 series motherboards already support Ryzen 5000 "Zen3" CPUs - VideoCardz.com
MSI B450 TOMAHAWK MAX II Gaming Motherboard (AMD Ryzen 3000 3rd gen ryzen AM4, DDR4, M.2, USB 3.2 Gen 1, HDMI, ATX) - Amazon.com
Check your Asus or MSI motherboard's AMD Ryzen 3000 compatibility here | PCGamesN
Amazon.com: MAXSUN Motherboard B550 Terminator Gaming M-ATX PC Motherboard AMD AM4 Zen 3, DDR4, PCIe 4.0, M.2, SATA 6Gb/s, USB 3.2 HDMI/VGA, Micro ATX AMD for Ryzen 5000 & 3000 Series Processors :
AMD Ryzen 3000 questions answered: Compatible motherboards, Intel comparison, streaming, gaming, and more - Newegg Insider
Amazon.com: MSI MPG B550 Gaming Plus Computer Gaming Motherboard (AMD AM4, Ryzen 5000 & 3000 Series, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, ATX) AMD PC Motherboards (Renewed) : Electronics
ASRock > B550M-ITX/ac
Amazon.com: Micro Center AMD Ryzen 7 5800X 8-Core 16-Thread AM4 Unlocked Desktop Processor with ASUS TUF Gaming X570-PLUS (WI-FI) PCIe 4.0 Dual M.2 USB 3.2 Gen 2 ATX Gaming Motherboard Bundle : Electronics
AMD Ryzen 3000 questions answered: Compatible motherboards, Intel comparison, streaming, gaming, and more - Newegg Insider
Biostar publishes list of 3rd Gen Ryzen-compatible motherboards and reveals "AMD Ryzen 3000 Desktop Ready" logo in the process - NotebookCheck.net News
How to Ensure Your Motherboard Will Support a Ryzen 3000 CPU | Tom's Hardware
ASUS X570 B550 B450 | Best AM4 Motherboard for AMD Zen 3 Ryzen 5000 CPU
Biostar releases a list of Ryzen 3000XT compatible motherboards - VideoCardz.com