Amazon.com: Apple MacBook Pro (15-Inch, 16GB RAM, 512GB Storage, 2.6GHz Intel Core i7) - Space Gray (Previous Model) : Electronics
Is 16 GB of RAM in the new Macbook Pro Enough?
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
MacBook Pro 17" Unibody RAM Replacement - iFixit Repair Guide
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MacBook Pro 8GB RAM Upgrade - Full Tutorial / Guide - YouTube