802.11ac is the latest wireless standard introduced for Wi-Fi, which means it is, obviously, the fastest as well.
ASUS made good use of it, and more, when it made the RT-AC56U concurrent dual-band router.
By means of a dual-core 800MHz processor and 256MB onboard DDR3 memory, it managed to provide the product with the ability to move data at 867Mbit/s on 5GHz and 300Mbit/s via 2.4GHz bands.
That makes for a total of 1167Mbit/s, which is nothing to scoff at when supposedly high-end dual-band routers have 750 Mbps rates (450 + 300 Mbps, respectively).
The two frequencies can work simultaneously too, which means that, if the receiver and/or sender device also has support for both, transfers can be done very, very quickly indeed.
For whoever wants the other specs, here is the short list: five Gigabit LAN (one in, four out), one USB 3.0, two USB 2.0, four antennas, 64-bit/128-bit encryption, support for Windows and Mac OS.