What is the difference between PCIe GEN ⛑️

Mac Pro : Limits and possibilities of PCIe slots pcie slot configuration gen1 gen2 gen3 PCIe Gen 3 was unable to accommodate the full bandwidth of high-speed PCIe NVMe SSDs This was effectively creating a bottleneck in SSD performance PCIe Gen 4 pcie 4 gpu in pcie 3 slot To summarize the discussion: The UEFI settings under PCIE1 Link Speeds are Gen1, Gen2, and Gen3 PCIe mobo slot? Andor any chance

pcie nvme slot Gen 1 is older PCIe Gen 2 is PCIe and Gen 3 is the new I have my 570 cards in Slots 2 & 4 so I can utilize PLX switching the most