Timetec 16GB KIT(4x4GB) 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 Upgrade at Amazon.com
4GB RAM Memory Upgrade for Apple iMac 12,1 Intel Core i3 21.5-inch MC309LL/A | eBay
Apple iMac 12.1 A1311, 21.5" 1920x1080 FULL HD, Intel Core i5 2400s (2ης γενιάς), 4GB RAM, 500GB HDD, Web Camera, DVD, MacOS