How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
Maximum memory for 2011 iMac - Ask Different
How to Upgrade the RAM in Your iMac
Install memory in an iMac - Apple Support
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
hardware - Can I add different size RAMs to iMac 5K? - Ask Different
16GB -2X8GB DDR4 Memory Ram Upgrade 27" Apple iMac-18.3 Mid 2017 Core i5-3.8GHz - £79.95 | PicClick UK
How to Upgrade the RAM in Your iMac
Can you upgrade the RAM in the 27-inch iMac? | iMore
Buy Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade Online
Memory Upgrades for Apple iMac 2011 Up to 32GB
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com