16GB Memory Upgrade Kit for 2012-2013 iMac 21.5-Inch
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
Install memory in an iMac - Apple Support
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
How to Upgrade/Install Memory in a 21.5-inch iMac (Late 2012– Mid 2014) iMac14,1 iMac14,3 - YouTube
Apple iMac 21.5" All-in-One Desktop Core i3-3225 3.3GHz 4GB RAM 500GB HDD Mac OS Mojave Early-2013 w/ Keyboard & Mouse ME699LL/A
Install memory in an iMac - Apple Support
The Display - 21.5-inch iMac (Late 2013) Review: Iris Pro Driving an Accurate Display
Apple 21.5" iMac® Intel Core i5 (2.3GHz) 8GB Memory 1TB Hard Drive Silver MMQA2LL/A - Best Buy
2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica
Mac RAM Upgrade, Best iMac Memory Upgrade – Best Reviews
SOLVED: Need more ram for iMac 21.5 late 2013 - iMac Intel 21.5" EMC 2638 - iFixit
Apple's new 'Assembled in USA' iMac a bear to upgrade, repair • The Register
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
I got a FREE 2013 iMac 21.5 with internal upgrades including Samsung evo ssd and 16gigs of ram. Then used open legacy patcher to install Mac OS Venture 13.5 beta. : r/osx