install - Installing and Upgrading Ram on a mid 2011 iMac (different size RAM) - Ask Different
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
How to Install RAM in an iMac: 5 Steps (with Pictures) - wikiHow
iMac, 2021, 24-inch, Apple M1, 2TB SSD, 16GB RAM, Green
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Apple 24" iMac with M1 Chip (Mid 2021, Silver) MGPC3LL/A B&H