Resposta para "Best replacement AirPort card?"Look for this PCI-E card: Assembled in China Model: AR5BXB112 FCC ID: PPD-AR5BXB112 IC: 4104A-AR5BXB112 OS X Lion supports this card. This is the card found in the Apple iMac 27" (2011). If this is not the newest card that Apple uses, it is very close to being the newest. It does not matter that the wireless card is much newer than the computer, so long as you are running OS X Lion or newer, and you have a system with three (3) antenna leads for 802.11n. If you search the usual places, including iFixit, you will find it at a decent price. I know what I am talking about. I just installed an AR5BXB112 in my MacBook Pro Core 2 Duo Late 2006. I should also add that I could not have done it without the excellent guide on iFixit: Installing MacBook Pro 15" Core 2 Duo Model A1211 Airport Extreme. Thanks for all the great help on this site!