The AirPort Extreme Card for Mac Pro (Early 2009 "Nehalem") from Apple adds 802.11n Airport Extreme Wi-Fi to Mac Pro computers with Nehalem processors. It installs in the Airport Extreme slot in the Mac Pro.
Compatible only with Nehalem-based Mac Pro systems; these systems use Xeon 5500 or 3500 CPUs and were introduced in March, 2009
Dual-band 802.11n Wi-Fi supports 2.4GHz and 5GHz networks