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