Amazon.com: MSI MPG X570 GAMING PLUS Motherboard (AMD AM4, PCIe 4.0, DDR4, SATA 6Gb/s, M.2, USB 3.2 Gen 2, HDMI, ATX) : Electronics
GIGABYTE X570 AORUS PRO WIFI AMD Ryzen 3000 PCIe 4.0 SATA 6Gb/s USB 3. – Epic Repair
GIGABYTE AM4 Motherboards: PCIe 4.0 Ready for Ryzen 3000
ASUS Pro WS WRX80E-SAGE SE WIFI II AMD WRX80 Ryzen Threadripper PRO extended-ATX workstation motherboard with Intel dual 10 G LAN, USB 3.2 Gen 2x2 Type-C port, 7 x PCIe 4.0 x16
Asus Rog Strix B550-A Gaming AMD AM4 Zen 3 Ryzen 5000 & 3rd Gen Ryzen ATX Gaming Motherboard (PCIe 4.0, 2.5Gb LAN, BIOS Flashback, Dual M.2 with heatsinks, Addressable Gen 2 RGB
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Gigabyte Amd B550 Ud Ac Gaming Motherboard - Amd B550 Chipset - Am4 Socket - Amd Ryzen 5000, 4000, 3000 Series Compatible - Pcie 4.0 Ready X16 Slot : Target
AMD confirms lack of PCIe 4.0 support on older motherboards