Teardown of New 4K 21.5-inch iMac Reveals Removable RAM and Modular CPU - MacRumors
Install memory in an iMac - Apple Support
Install memory in an iMac - Apple Support
Buying a New iMac? Here's the Info on the 2017 iMac RAM Upgrades
How To: Upgrade 2017 5k iMac RAM to 64GB & Saved $840 | 2018 - YouTube
How to Upgrade the Memory in the iMac Pro (late 2017) - YouTube
OWC Confirms 64GB of RAM in Apple 27" iMac 2017
Consomac : Comment changer ou ajouter de la mémoire vive à l'iMac 27'' de 2017 ?
Memory Upgrades for 2017 iMac 27-Inch
Amazon.com: OWC 32GB (2 x 16GB) PC19200 DDR4 2400MHz SO-DIMMs Memory Compatible with Mac Mini (Late 2018), 27" and 21.5" iMac (Mid 2017), and Compatible PCs (OWC2400DDR4S32P) : Everything Else