How to Upgrade Memory in a Late 2009 21.5-inch or 27-inch iMac - YouTube
How to upgrade RAM on iMac 21.5" 2011 - YouTube
iMac 27 RAM memory upgrade Easy How To Tutorial Mid 2011 - YouTube
21.5” mid-2011 iMac wires? Finally trying to upgrade my RAM and these wires are blocking the slot — did get an iMac with poor build quality? What can I do? : r/mac
Macbook Pro 16GB RAM Upgrade - 6 iMac Repair Centers in Toronto Mississauga Vaughan Ajax Brampton North York Vaughan Ajax Brampton
install - Installing and Upgrading Ram on a mid 2011 iMac (different size RAM) - Ask Different
Install memory in an iMac - Apple Support
NEMIX RAM 32GB (4x8GB Upgrade) DDR3-1333 PC3-10600 204-Pin SODIMM Memory for Apple MacBook Pro Early/Late 2011, iMac Mid 2010 27 inch 4-Core, iMac Mid 2011 21.5/27” , Mac Mini Mid 2011 at Amazon.com