What size PCIe card slot do I need?

What is PCI Express? Do PCIe lanes, slots, and versions matter? pcie slot dimensions 1) Mechanical Lane requirement: the type of PCIe slot required by the card “x8 x16” pcie 4 nvme in pcie 3 slot PCIE slot cover for 2E cases E185, E190-3U, E171, E1802-500, E1801-400, E183-400, 120х17 mm Where to buy

pcie 4 card in pcie 3 slot However, there is usually a cost increase incurred with higher lane counts PCIe Slot Differences Photo from 20050531pci-express-cards