The Macbook Pro 2011 inaugurated an innovation that remains discrete at Apple, this is the arrival of Wi-Fi capable to reach the 450 Mbits/s.
It seems that Apple seeks to standardize this data flow. Thus, the new iMac is also compatible with the 450 Mbits/s. For that, Apple changed their Airport card and also installed 3 antennas (instead of 2 before), something indispensabie to be able simultaneously to use 3 channels of 150 Mbits/s.
As a reminder, to reach such a flow, it is imperative to have a compatible base station, like current Airport Extreme and Time Capsule, but also to connect themselves in 802.11n on 5 GHz and also to activate the option of widened channels.
To finish, we remind to you that we tested the Airport at this data flow recently.