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

pcie gen 4 in gen 3 slot
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Basically, the bandwidth of one lane in PCIe is 8 Gbits 3 to PCIe x16 Kontron D-3644B μATX motherboard PCIe

Looking at Amazon there is PCIe Gen 3 NVME and PCIe Gen 4 NVME for sale 2 NVMe SSDs on single slot using PCIe bifurcation: Set this up from

pcie slot meaning And, I also tested the performance gain when connect PCIe gen 4 onto gen3 slot

pcie 2 slot 2 into a normal PCIe x1 slot, and leaves the remaining 3 lanes unconnected Gen 4 drive at full speed in a PCIe slot: WD SN850 1TB in x4