Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Maximum memory for 2011 iMac - Ask Different
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
iMac Intel 21.5" EMC 2544 Teardown - iFixit
2012 21.5-Inch Apple iMac Review: Slim, Sleek, And Stylish, But Far From Shallow | TechCrunch
How To Upgrade RAM in a Mac | Macworld
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Apple iMac Late 2012 27-inch 2.9GHz Core i5 Desktop DDR3 RAM Memory | Kingston
Apple iMac compatible RAM and SSD upgrades | Upgradeable
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)