How to Upgrade Memory in a 27-inch iMac (Late 2012-2013) iMac13,2 and iMac14,2 - YouTube
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
How to Upgrade iMac RAM: 2012-2022: EveryMac.com
NEMIX RAM 16GB Kit (2x8GB Upgrade) DDR3-1600 SODIMM PC3-12800 for Apple MacBook Pro Mid 2012 / iMac Late 2012 / iMac 2013, Late 2014, Mid 2015, Mac Mini Late 2012 at Amazon.com
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Late 2013 iMac review: Faster than before, but the gains over previous models are modest | Macworld
Apple iMac 21.5" Late 2013 Core i5 2.7GHz 8GB RAM 1TB HDD MacOS Big Sur 11.5.7 | eBay