NEMIX RAM 32GB Kit (4x8GB 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
iFixit Compatible with Memory Maxxer RAM Upgrade Kit MacBook Pro 13" Unibody Mid 2012 at Amazon.com
How to Upgrade Memory in a 27-inch iMac (Late 2012-2013) iMac13,2 and iMac14,2 - YouTube
iFixit Teardown of the New Late 2013 iMac [Photos] - iClarified