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

What is the difference between PCIe Gen 3 and PCIe Gen 4? pcie 8x slot I was looking into the card because the old GPU was just inserted into the slot and had no other power cables and 750 ti seems to be a similar pcie x1 in x16 slot The x8 slots are PCIE , and for network or SSD adapters Not sure if the 8 lanes are shared, or if it's x8 per PCIE slot Since it's PCIE

pcie x1 in x16 slot The PCIe Gen 3 Switch allows users to take advantage of a single PCIe x8 slot, through the use of QIP2X-PCIE8XG302, and transform their PCIe

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