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
Dual M.2 PCIe NVMe Adapter Without PCIe Splitter Function (PCIe Bifurcation Motherboard is Required), Support M.2 PCIe 4.0/3.0 SSD Soft RAID Setup in Windows/Linux
GIGABYTE AMD Radeon RX 6600 EAGLE 8GB GDDR6 PCI Express 4.0 Gaming Graphics Card Black GV-R66EAGLE-8GD - Best Buy
AMD Ryzen 7 5800X3D review - PCI-Express 4.0 and the X570 Chipset
XFX SPEEDSTER SWFT210 AMD Radeon RX 6600 8GB GDDR6 PCI Express 4.0 Gaming Graphics Card Black RX-66XL8LFDQ - Best Buy
PCI Express 4.0 has incredible bandwidth. Do you need it now or is it better to wait?
AMD Ryzen on Twitter: "Ryzen 3000 series' PCIe 4.0 compatibility means your PC is ready for the future with double the data bandwidth, backwards compatibility, and the ability to connect more devices
Sapphire PULSE AMD Radeon RX 6500 XT 4GB DDR6 PCI Express 4.0 Graphics Card Black 11314-01-20G - Best Buy
AMD's Latest AGESA Update Removes PCIe 4.0 Support from Pre-X570 Motherboards | TechPowerUp