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If your MacBook is a Core 2 Duo, it will have one in it. If you have one of the first generation Core 2 Duos (low end 1.83 and high 2.0 Ghz) it needs to be enabled. Any other Core 2 Duo MacBook will have 802.11 N standard, though not a Core Duo MacBook.
 
Mine says Airport extreme in the aiport card info does this have wireless N???? I have core 2 duo 2.16 and Leopard.
 
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