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Crucial 8GB Memory Upgrade for Apple MacBook Pro 13 inch (Mid 2012) PC3-12800S 1600MHz DDR3 SODIMM RAM (Crucial CT8G3S160BM Equivalent) - Newegg.com
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Memory Upgrade at Amazon.com
CT3373650 Crucial 16GB SoDimm PC12800 Memory
16 GB RAM Upgrade on MacBook Pro 15" (mid 2012) NON Retina - YouTube
memory - 16GB 1600mhz vs 16GB 1866mhz RAM for Macbook Pro 13" mid 2012 - Ask Different