Buy Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3L 1600MHz PC3L-12800 CL11 for iMac (Mid 2011, Late 2012, Late 2013, Late 2014 Retina 5K, Mid 2015 Retina 5K) SODIMM Memory Module MAC RAM
iMac Memory RAM Upgrades Up to 128GB
iMac (21.5-inch, Late 2012) - Technical Specifications
How To Upgrade RAM in a Mac - Macworld UK
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Install memory in an iMac - Apple Support
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
Refurbished Apple iMac 13,2/i7 3770/16GB Ram/1TB HDD/27"/B - (Late 2012), B - Mobilehotspot
Ram memory and SSD upgrade for iMac13,2 late 2012 27-inch