HomeLab: Which PCIe slot for 10GbE NIC? by Life-is-short--so

Then you also have PCIe GEN 3 and GEN 4, which are currently unnecessary until PCIe resize bar support will be more common and not dedicated only for Ryzen

3rd Gen Intel® Xeon® Scalable Processors • 32x DIMM slots • 4x ” SATASASNVMe • 4x ” NVMeSATA • 2x PCIe Gen 4 x16 slots, 2x FHFL • 1x OCP

pcie 4 m2 in pcie 3 slot Gen4 drives often have betternewer hardware so will run better in a Gen3 slot than a native Gen3 drive in many if not most cases, but you

pcie2 slot PCIe SSDs are twice as fast as PCIe SSDs But next-generation PCIe SSDs will double PCIe Gen 4 speeds