iMac (27-inch, Late 2012) - Technical Specifications
27" iMac Offers Easier RAM Upgrade
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 (27-inch, Late 2012) - Technical Specifications
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)