What is a PCIe slot with an x4 slot and x16 connector?

Using a PCIe x1 card in a PCIe x16 slot pcie x4 in x16 slot Next Generation Storage：1*PCIe x4 and 2*PCIe x4 Connectors EZ-Latch：PCIe x16 Slot & Connectors with Quick Release & Screwless Design pcie x1 in x16 slot Côté PCIe, nous avons un premier slot en x16 ainsi que deux en PCIe x4 et un dernier en PCIe x2 Côté Ethernet, nous avons

pcie gpu slot The PCI Express x1 to x16 adapter accommodates low profile x2, x4, x8, x12 or x16 PCI Express cards, eliminating the cost and hassle of upgrading a PCIe card or