1 M.2 NGFF Key A+E to PCIe X16 Extender Cable. 【Function】M.2 Key A+E to PCIe X16 Extender Cable can convert the M.2 slot into the PCIe X16 slot, which is used to connect various PCIe X16 devices such as graphics cards, and can also supports PCIe X8, X4, and X1 devices.