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
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Teardown of New 21.5-inch iMac Reveals Glued Down LCD and Dual Microphones - MacRumors
Apple iMac 27-Inch (2012) Review - SlashGear
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
Can you upgrade the RAM in the 27-inch iMac? | iMore
Apple's 27" iMac Late 2012 model. How to upgrade the ram to 16GB - YouTube
Apple's 2012 iMac: Ready for its close-up (pictures) - CNET