Mac mini Server (Mid 2011) Technical Specifications
Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.com
The Display - The 27-inch Apple iMac Review (2011)
Upgrade Your 2011 Mac Mini To 16GB Of RAM - YouTube
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
RAM Upgrade for iMac Mid 2011 21.5-inch | MacRumors Forums
Adamanta 16GB (2x8GB) Apple Memory Upgrade DDR3L 1600MHz SODIMM Compatible for iMac (Mid 2011, Late 2012, Early/Late 2013, Late 2014, Mid 2015), MacBook Pro (Early/Late 2011, Mid 2012), Mac Mini RAM at Amazon.com
CMS 8GB (2X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® Mac Mini Core I7 2.7 (Mid-2011) - A29 at Amazon.com
A-Tech 16GB Kit (2x8GB) RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Mid-2011 iMac - Upgrading RAM from 4GB to… - Apple Community
Apple 27" iMac with Retina 5K Display (Mid 2017) Z0TR-MNED43-BH
Review: 21.5-inch 2012 iMac takes two steps forward, one step back | Ars Technica
Timetec 32GB KIT(4x8GB) 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
By the numbers: Apple's new iMac vs. the Windows 8 all-in-one competition - The Verge