Until recently, the fastest 802.11ac routers were labeled 'AC1750' or something along those lines. That refers to the combined theoretical bandwidth of the 2.4 GHz and the 5 GHz bands. On 2.4 GHz that is 450 Mbps and on 5 GHz that is 1.3 Gbps. The new routers have the same speed on the 5 GHz frequency, but on 2.4 GHz they're now capable of 600 Mbps. The ASUS RT-AC68U and the Linksys EA6900 we will look at today are the first two routers of that new generation.