Amazon.com: ASRock B550 PRO4 ATX Motherboard (M.2, PCIe 4.0, SATA 6Gb/s, M.2, USB 3.2 Gen 2, DDR4, ASRock Super Alloy, High Density Glass Fabric PCB) with AMD Ryzen 7 5700X 8Core 3.4GHz
Best B550 Motherboards: AMD's More Affordable PCIe 4.0 Option | Tom's Hardware