How to Upgrade/Install Memory in a 21.5-inch iMac (Mid 2017) iMac18,1 iMac18,2 - YouTube
Install memory in an iMac - Apple Support
Timetec Kit de 32GB (2x16GB) Compatible para Apple 2017 iMac (27 Pulgadas con Retina 5K, 21.5 Pulgadas) DDR4 2400MHz PC4-19200 SODIMM Mac RAM Upgrade para iMac18.1/iMac18.2/iMac18,3 : Amazon.es: Informática
Unboxing, Teardown of 2017 21.5-inch iMac (Non-Retina Model)