crwdns2934241:0crwdne2934241:0 Tim D
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Unfortunately, you cannot upgrade the RAM on a MacBook Air. It is soldered in place. (Src: https://everymac.com/systems/apple/macbo...) If you have the 4 GB model, you can buy a 8GB logic board ([product|IF188-094]) and replace it, using the step-by-step instructions at ifixit. Here is a link: [guide|15388]
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open