What is the difference between PCIe Gen 3 and PCIe Gen 4?

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PCIe Gen x 16 Front IO ports 1 x USB Type-C, 2 x USB Rear IO Vertical GPU: up to 4 slots; horizontal GPU: 3 slots drive mounts

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pcie slot configuration gen1 gen2 gen3 PCIe Gen3 x4 PCIe slot to SFF-8644 Passive Adapter ; Part #:, PCI-AD-x439-01H ; Newest Version: LINK ; Description: New Gen3, x4 – SFF-8639 PCIe horizontal