How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Just installed 16 GB RAM, and a 1TB SSD in my still in use 2011 MacBook Pro. General appreciation post for this incredible machine. They don't make em like this any more. :
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Macbook Pro (Late 2011) Memory Upgrade - Apple Community
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MacBook Pro Memory Upgrade - How-tos and DIY - Corsair Community
Apple MD633G/A 8.0GB (2 x 4GB) Factory Original... at MacSales.com
Macbook Pro RAM Upgrade Kit 8GB 2 x 4GB 2011 2012 A1278 A1286 13 15" 10600s DDR3 836905536579 | eBay
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
MacBook Pro 15" Unibody Early 2011 RAM Replacement - iFixit Repair Guide
Timetec Hynix IC 8GB Compatible for Apple DDR3L 1600MHz PC3L-12800 SODIMM Memory Upgrade for Early/Mid/Late 2011, Mid/Late 2012, Early/Late 2013, Late 2014, Mid 2015 MacBook Pro, iMac, Mac Mini (8GB) - Newegg.com
4GB Memory Upgrade for 2011 MacBook Pro, iMac, and Mac mini