How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
Apple iMac 27" i5 2.7 (Mid 2011) - Technical data and benchmarks
iMac Intel 27" EMC 2309 and 2374 RAM Replacement - iFixit Repair Guide
How to upgrade RAM on iMac 21.5" 2011 - YouTube
21.5-inch or 27-inch iMac (Mid 2011) Memory Installation iMac12,1 iMac12,2 - YouTube
Apple iMac 2.5Ghz i5-2400S (Mid-2011) *No HDD/RAM* – MSU Surplus Store
Install memory in an iMac - Apple Support
Memory Upgrades for Apple iMac 2011 Up to 32GB
The New 2011 iMacs: Specs and Details
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
iMac Intel 21,5" Mid 2011 EMC 2428 - used original spareparts for Macs
Install memory in an iMac - Apple Support
Upgrading 27" iMac (2011) To 32GB Of RAM - YouTube
Install memory in an iMac - Apple Support
A-Tech 8GB 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 Module at Amazon.com
Maximum memory for 2011 iMac - Ask Different
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
Install memory in an iMac - Apple Support
Apple iMac 21.5 A1311 (Mi 2011) (I524S1648S) · Reconditionné - Ordinateur Mac reconditionné Apple sur LDLC
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com
iMac Intel 27" Mid 2011 EMC 2429 - used original spareparts for Macs
OWC 32GB MaxRAM Upgrade Turns Apple iMac Into Ideal Workstation With Double The Factory Memory At 40 Percent Lower Cost
Install memory in an iMac - Apple Support
How To Upgrade RAM in a Mac | Macworld
