How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
2012 Macbook Pro 13" A1278 RAM Upgrade - YouTube
15-inch MacBook Pro Late 2008 Memory Installation Video - YouTube
MacBook Pro: How to remove or install memory - Apple Support
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OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com
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A-Tech 8GB Kit (2x4GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/