What Does PCIe x16 Mean?

PCIe x4: This slot has four lanes for data transfer It provides more PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 slots

Lenovo GeForce GT 730 2 GB GDDR5 PCIe x16 Low Profile Video Card Pre-Owned: Lenovo

pcie slot cover Expansion slots: 1x PCIe x16, 1x PCIe x4, 1x PCIe x1 Video ports: 1x DisplayPort 1x HDMI USB: Up to 1x USB Gen2x2

pcie 4 m2 in pcie 3 slot Have you ever thought if you can plug PCI Express cards into x16 lane slot? In this video