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