Unex DAXA-ED5

Overview
"48DAXA51.0GA" and "2016/04/21" is silkscreened on the board.
 * OEM: Wistron NeWeb

Features
DAXA-ED5 is an 802.11a/n/ac 5GHz single band 4x4 MU-MIMO Wave 2 PCIe mini card module which is designed to optimize the way Wi-Fi® devices are served in crowded carrier and enterprise environment. Features MU-MIMO, 256-QAM modulation, and explicit and implicit beamforming, DAXA-ED5 greatly improves Wi-Fi® performance for the growing number of connected devices in home, offices, and public hotspots.
 * 802.11an/ac (5GHz), Wave 2, MU-MIMO
 * 256-QAM modulation, Tx beamforming
 * Data rate: up to 1.73Gbps (20/40/80MHz)

Links of Interest
Datasheet