PCIE x1 card in PCIE x16 slot?

What is PCIe x16 Slot pcie x 16 slot List of Motherboards with 4 PCI-Express x16 Slots: ASUS Pro WS TRX50-SAGE WIFI, GIGABYTE A620M C, GIGABYTE B650M C V2, ASUS Prime B760M-A AX, GIGABYTE B760M pcie slot dimensions It's a slot of x16 size but electrically x4 This

pcie 8x slot PCIe x1 and 16 lane PCIe x16 It is a serial bus point-to-point protocol General processors use the smallest PCI x1 slots Graphic cards use the longest