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 in pcie 3 slot ssd An 2280 solid-state drive , 22 mm wide and 80 mm long Connects to, Motherboard via one of: PCIe ×4; PCIe ×4; PCIe ×4; Serial ATA pciex16 slot 12th-generation Alder Lake processors offer greatly enhanced support of PCIe lanes Although the CPU only manages 4 PCIe Gen4 lanes, which is only enough for

pciex16 slot Your PCIe card will run at the lowest generation present So if you put a PCIe card in a PCIe slot, you'll get PCIe performance

pcie nvme slot 12th-generation Alder Lake processors offer greatly enhanced support of PCIe lanes Although the CPU only manages 4 PCIe Gen4 lanes, which is only enough for Your PCIe card will run at the lowest generation present So if you put a PCIe card in a PCIe slot, you'll get PCIe performance