It has 5GHz capability so you may as well buy adapter with that frequency or with both, 2.4GHZ(802 .11n) or/and 5GHz. 5GHZ is faster but with less range and less penetration thru walls. If it's for internet only and you don't have super high internet speeds (150 Mb/s +) it doesn't matter. USB3 is no advantage either.