Apple iMac (mid 2011), 27in Review: Apple iMac 2011 review: Apple's new iMac is also its best, with plenty of power - Desktop PCs - Home PCs - PC World Australia
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
32GB 4x8GB PC3-10600 DDR3 1333MHz SODIMM Memory Ram for Apple iMac 27" Mid 2011 | eBay
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
Install memory in an iMac - Apple Support
How to Upgrade iMac RAM: 2012-2020: EveryMac.com
A-Tech 16GB (2x8GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
By the numbers: Apple's new iMac vs. the Windows 8 all-in-one competition - The Verge
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
A-Tech 16GB (4x4GB) RAM for Apple iMac (Mid 2010, Mid 2011, Late 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
install - Installing and Upgrading Ram on a mid 2011 iMac (different size RAM) - Ask Different