16GB [4x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Apple iMac 12,2 (27-inch, 2.7GHz, MC813LL/A) Quad-Core Intel Core i5 (Genuine A-Tech Brand) at Amazon.com
iMac i7 Memory Model 11.3 (i5 and i7) 12.1 & 12.2 | Ramjet.com
How to Upgrade/Replace the Main Drive in a 27-inch Apple iMac 2011 (iMac12,2) - YouTube
Install memory in an iMac - Apple Support
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
8GB [2x4GB] DDR3-1333 RAM Memory Upgrade Kit for The Apple iMac 12,2 (27-inch, 2.7GHz, MC813LL/A) Quad-Core Intel Core i5 (Genuine A-Tech Brand) at Amazon.com
Apple iMac 2011 (Mid) 27-inch 2K (iMac 12,2) SSD ,Ram & OSX Upgrades - ZD Laptop Service Centre