If you MUST use wireless.. "bless ur cursed soul"
For AC, it's only faster than N if you're within 12-15 feet of the router..
Outside of that range AC and N perform equivalently..
U mean the alienware x51 desktop ?
dude, that HAS a wifi card.. You just pull out the one in there, and put in a new one..
Get the 6300N if you're gonna use ur N66u, or get an intel AC7260, if you get a NEW ac router.