What speeds are you actually connecting at with the devices?
Getting over 800mbps you have to have a fairly new device and be very close to the router on 5Ghz.
Check in the wireless log page the client connection speed.
Sent from my iPhone using Tapatalk
Basically each radio in a 5Ghz device can do 433Mbps so depending how many they have (mobile devices usually only have 2, laptops/desktops can have 3 or 4) you get multiples of that number as your max Wi-fi speed.
Welcome To SNBForums
SNBForums is a community for anyone who wants to learn about or discuss the latest in wireless routers, network storage and the ins and outs of building and maintaining a small network.
If you'd like to post a question, simply register and have at it!
While you're at it, please check out SmallNetBuilder for product reviews and our famous Router Charts, Ranker and plenty more!