Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
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
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple's 2012 iMac: Ready for its close-up (pictures) - CNET
Apple iMac 27-inch (Latest Slim Model) i5 12GB RAM 1TB HD OS X Yosemit | Laptop Workshop
Install memory in an iMac - Apple Support
iMac | 2.9 GHz Intel i5 | 27 Inch | Late 2012 - Techable.com
How to upgrade the memory of a 27-inch iMac with Retina 5K display (Late 2014 - Mid 2015) iMac15,1 - YouTube
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com