Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
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
How to upgrade iMac (2020) RAM and save up to $2000 - 9to5Mac
Install memory in an iMac - Apple Support
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET