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Replace your 2009-2012 MacBook Pro HD with an SSD
MacBook Pro 15" Retina Display Mid 2012 Teardown - iFixit
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
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
Now Here's a MacBook Pro That's Easy to Repair | WIRED