OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
Memory Upgrades for Apple iMac 2011 Up to 32GB
8GB Kit (2 x 4GB) PC3-10600 RAM for Apple iMac Mid 2011 - 21.5 Inch MC812LL/A Memory Upgrade Kit