display - How can my mid-2012 MacBook Pro Retina 15 run a 4K panel at 30Hz over HDMI? - Ask Different
Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.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
Upgrade Your Macbook Pro (SSD Upgrade, RAM Upgrade, Optical Drive Bay Adapter) - YouTube