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15" MacBook Pro Retina A1398 - Logic Board Mid 2014
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How to add more RAM to your MacBook Pro - CNET
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Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.com
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Macbook Pro 13" Retina A1502 Take Apart (2014 Model) - YouTube
DIY MacBook Pro Ram Upgrade (16GB) Blazing Fast - YouTube