How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
Apple Mac Memory Ram Upgrades Dublin
SSD Upgrades for Apple iMac 27-Inch Late 2013 - 2019
Install memory in an iMac - Apple Support
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
Configure your own 21.5-inch Apple iMac (2013) at OWC
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
Apple's 2012 iMac: Ready for its close-up (pictures) - CNET
HOW I UPGRADED MY iMAC 21.5in Late 2013 MODEL (SSD & RAM UPGRADE) - YouTube
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Install memory in an iMac - Apple Support
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
How to upgrade RAM iMac late 2013 21.5inch - break & fix MOVIE - YouTube
iMac 2013 Model Ram Upgrade - YouTube
21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
iMac Intel 21.5" EMC 2638 Teardown - iFixit
iMac RAM Upgrade mixing different memory sticks: 27” iMac late 2013 - YouTube
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
How to Upgrade Memory in a 27-inch iMac (Late 2012-2013) iMac13,2 and iMac14,2 - YouTube
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I5 3.4 27-Inch (Late 2013) Me089Ll/A - A7 at Amazon.com