Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
Install memory in an iMac - Apple Support
16GB KIT 2X 8GB for Apple iMac 2.7GHz 21.5" Late 2013 2.93GHz 27" Late
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
APPLE IMAC LATE 2012 27" INCH i7 3.4GHz QUAD 16GB RAM 1 TB HD | eBay