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
install - Installing and Upgrading Ram on a mid 2011 iMac (different size RAM) - Ask Different
Can you upgrade the RAM in the 27-inch iMac? | iMore
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
Install memory in an iMac - Apple Support
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
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
By the numbers: Apple's new iMac vs. the Windows 8 all-in-one competition - The Verge