Reemplazo de RAM del iMac Intel 21.5" Retina 4K Display (2017) - Guía de reparación iFixit
How to upgrade RAM iMac late 2013 21.5inch - break & fix MOVIE - YouTube
How to Upgrade/Replace the Memory in a 21.5-inch iMac (2019) iMac19,2 - 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
Install memory in an iMac - Apple Support
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
16GB -2x8GB Memory Ram Upgrade 21.5" Apple iMac-13.1 Core i3 3.3GHz Early 2013 | eBay
OWC SSD Upgrade Kits for 21.5-Inch iMac (2013 - 2019)