Go into the utilities folder in your applications section and click on network utility. Under the info tab, pull down the "network interface (en1)" section. Look at Model Wireless Network Adapter and it will say something along the lines of 802.11 a/b/g/n. If there is an "n" there, that means you are wireless-n capable and provided you have a wireless-n router you will be getting those speeds. If there is no n there then you need to go on the apple site and download the wireless-n update for $1.99.