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
AMD Radeon Pro W6600 100-506208 8GB 128-bit GDDR6 PCI Express 4.0 x16 Workstation Video Card Workstation Graphics Cards - Newegg.com
PCI Express 4.0 has incredible bandwidth. Do you need it now or is it better to wait?
PCI Express 5.0 spec is finalized just as AMD starts pushing PCIe 4.0 to Ryzen | PC Gamer
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
PCIe 4.0: Everything you need to know, from specs to compatibility to caveats | PCWorld