How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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MAC BOOK PRO A1278 (MID.2012) INTEL CORE i5 2.5 GHZ HDD 500 GB / RAM 4.0 GB DISPLAY 13.3
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4 Best RAM Upgrades for Old MacBook Pro (Reviews)
Mac Pro - Wikipedia
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