ASUS GT AC5300 Speed Problems

Just got my Rog Rapture yesterday..
Looks nice.. acts nice.. seems scared to go fast.

I have gigabit internet.
With my old router (linksys) my download speed is around 930 Mbps.

I plug in my 5300 and it drops to ~ 300 Mbps.

Any ideas what the problem could be??

thanks

(Router has been update to latest Firmware)