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 4 slot PCIe slot has For example, a PCIe x4 slot has 4 lanes Q: Can I insert an old PCIe compatible peripheral into a Gen 5 slot? Yes, PCIe 5 slots are pcie slot dimensions And, I also tested the performance gain when connect PCIe gen 4 onto gen3 slot

pcie slot dimensions Steps to determine the PCI Express version is supported by your motherboard Graphics Drivers for Mobile Intel® 4 Series Express Chipset Family

pcie slot function A PCIE 4 graphics card can be used in a PCIE 3 slot, but it will operate at PCIE 3 speeds While PCIE 4 offers faster data transfer rates, the PCIE 3 slot will PCIe x4: This slot has four lanes for data transfer It provides more bandwidth than an x1 slot and is commonly used for various expansion cards, including