Can you explain the different versions of PCIe ?

pcie slot configuration gen1 gen2 gen3
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PCI Express Gen2 and Gen3, IO Virtualization, FCoE, SSD and PCI Express Storage Devices are here What are PCI Express Storage Devices

Not asked, but nice to know: A PCI-e v3 card will run fine on an PCI-e v2 slot – Hennes Commented Apr 23, 2014 at 18:41 Add a comment 2

pcie slot cover Set the PCIe slot as Generation 1, 2 or 3 This slot numbering appears only when data adapter is installed at left wing Some adapters may not operate

pcie 4 gpu in pcie 3 slot Gen 1 ; Gen 2 ; Gen 3 Gen 3 PCI-E Port DeEmphasis Specifies the de-emphasis settings of the PCIe port