Is it possible to upgrade MacBook Pro (Retina, 15-inch, Mid 2014) to 32GB RAM? - Quora
How to upgrade Apple MacBook Pro RAM - YouTube
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
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
Apple Logic Board, 3.0Ghz 8GB for MacBook Pro Retina 13" Mid 2014, A1502, MacBookPro11,1 - Apple Force
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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
SOLVED: Can RAM be upgraded? - MacBook Pro 13" Retina Display Mid 2014 - iFixit
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MacBook Pro 13" Retina 2.5GHz Logic Board, Late 2012 - 661-7006
Apple MacBook Pro with Retina Display (15-inch, 2014) review: Still the best higher-res laptop, but the competition is catching up - CNET
Apple MacBook Pro 13-inch (2013) Review | PCMag
Review: Apple's mid-2014 13-inch MacBook Pro with Retina display | AppleInsider
13-inch MacBook Pro Retina Review (Late 2013)
Review: Apple's mid-2014 13-inch MacBook Pro with Retina display | AppleInsider