PCI Express 4.0 arrives in July, but you need a new AMD Ryzen processor by Jose Antunes - ProVideo Coalition
Asus B550M-PLUS Wi-Fi AMD AM4 TUF Gaming Motherboard PCIe 4.0/Aura Sync RGB - Online | KG Electronic
ASUS AMD B550 ROG STRIX B550-A GAMING (Ryzen AM4) ATX MB, Dual M.2, PCIe 4.0, 2.5Gb Ethernet, DP/HDMI2.1, SATA 6Gbps, USB 3.2 Gen 2 Type
PCIe 4.0: Everything you need to know, from specs to compatibility to caveats | PCWorld
AMD ASUS X570 ATX gaming motherboard with PCIe 4.0, 12+4 power stages, and WiFi 6E (802.11ax), Realtek 2.5 Gb Ethernet, Two-Way AI Noise Cancelation (ROG-STRIX-X570-E-GAM-WIFI-II) | Rosman Computers