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Note: only PCIe X1 speed at max, can not reach PCIe X4 full speed. Upper Key-E slot for M.2 Key-E/A+E wifi module Antenna for M.2 WiFi Module. Screws for WiFi module Installation. As the IPEX4 interface is very small, it is easy to fall off when snapping the network card interface, so cover the IPEX4 interface with insulating tape so that it will not fall off.