I am getting 144.0Mbps....
Product Page : DAP-1522 Firmware Version : 2.02 Hardware Version : B1
Region US
DAP set to N Only, WPA2, AES, Auto Bandwidth.
1 time I did see the speed at 246Mbps and drop to 214Mbps and then back to 144Mbps so I am guessing the card supports it.....but must not do it well since I have not seen it go above 144Mbps other than the 1 time which was really only a few seconds.