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Amazon.com: Apple MacBook Pro 15in Core i7 2.8GHz Retina (MGXG2LL/A), 16GB RAM, 512GB Solid State Drive (Renewed) : Electronics
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
Apple MacBook Pro 15 Retina - Mid 2014 Reviews, Pros and Cons | TechSpot
Can I upgrade the RAM of the MacBook Pro 13' Retina from 8gb to 16gb after/during purchase? - Quora
macbook pro - Can I upgrade RAM on late 2013 retina Mac Book Pro? - Ask Different