Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
What Does It Take To Upgrade a 2012 iMac 21.5"?
21.5" iMac Has No User-Upgradable RAM; 27" Has Four Accessible RAM Slots - MacRumors
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
iMac RAM for Model 13.2 to 15.1| DDR3-1600MHz | 8GBx4 | MacMemory.com
How To Upgrade RAM in a Mac | Macworld
2012 21.5-Inch Apple iMac Review: Slim, Sleek, And Stylish, But Far From Shallow | TechCrunch
Install memory in an iMac - Apple Support
Apple's 27" iMac Late 2012 model. How to upgrade the ram to 16GB - YouTube
Harder, better, faster, stronger: A review of the 27-inch iMac | Ars Technica
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com