The code was located by a tipster inside of the operating system’s WiFi-frameworks folder. As you can see in the image directly below, the 802.11ac code is not found in OS X 10.8.3, which is the latest public release of Apple’s Mac operating system.
A report from earlier this year said that Apple had struck a deal with chip maker Broadcom to outfit its new Macs with 802.11ac chips. Theoretically, the standard will result in multi-station WLAN throughput of at least 1 gigabit per second (1 Gbit/s) and a maximum single link throughput of at least 500 megabits per second (500 Mbit/s). For comparison, 802.11n delivers about a third of the speed of 802.11ac.