ESUS IT Memoria RAM UPGRADE 8GB per Apple iMac 21.5" Late 2012 & 27" Late 2012 2013 2014 | Mid 2015 DDR3 1600MHz SODIMM : Amazon.it: Informatica
SOLVED: How do I increase my RAM/Memory 2015? - iMac Intel 21.5" Retina 4K Display (2015) - iFixit
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
UPGRADE: iMac 21", A1418-A2116
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube