What is the difference between PCIe Gen 3 and PCIe Gen 4? - Kingston Technology
Is PCI-E 4.0 compatible with an RTX 2080 Ti? - Quora
Z590 Motherboards Feature PCIe Gen 4.0 Compatibility Only With 11th Gen Intel Rocket Lake Core i9, Core i7, Core i5 CPUs
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
PCIe 4.0: Everything you need to know, from specs to compatibility to caveats | PCWorld