ASUS PRIME B760M-A AX D4 Intel B760 (LGA 1700)((13th and 12th Gen) mATX
GIGABYTE B550M DS3H AM4 AMD B550 Micro-ATX Motherboard with Dual M.2, SATA 6Gb/s, USB 3.2 Gen 1, PCIe 4.0 - Walmart.com
AMD Reveals the X570 Chipset: PCIe 4.0 is Here
Asus publishes X470 and B450 PCIe Gen 4 compatibility chart - Mainboard - News - HEXUS.net
MSI PRO B550-VC ProSeries Motherboard AMD AM4 DDR4 - NWCA Inc.
AM4 Motherboard MSI B550M PRO-VDH WIFI, PCIe 4.0/ 3.0 x16 slot 4 SATA 6Gb/s ports M.2 Support Wi-Fi 802.11 For Ryzen 5 5600 - AliExpress
Amazon.com: MSI PRO B550M-VC WiFi ProSeries Motherboard (AMD AM4, DDR4, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI/DP, Wi-Fi, mATX) : Everything Else
ASUS PRIME B550M-A/CSM AM4 Micro ATX AMD Motherboard - Newegg.com
ASUS Prime B550M-A/CSM AMD AM4 (3rd Gen Ryzen) microATX Commercial Motherboard (PCIe 4.0, ECC Memory, 1Gb LAN, HDMI 2.1/D-Sub, 4K@60HZ, TPM, ASUS Control Center Express) - Walmart.com