Apple iMac 27-inch (Latest Slim Model) i5 12GB RAM 1TB HD OS X Yosemit | Laptop Workshop
Apple iMac (Late 2012) review (21.5- and 27-inch) | Macworld
A-Tech 8GB Kit (2x4GB) 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
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)