64GB Memory upgrade for 21.5-inch iMac 2019 (2 x 32GB)
OWC - 32GB OWC Kit de actualización de Memoria - 4 x 8GB PC21300 DDR4 2666MHz SO-DIMMs para iMac 27" con Pantallas Retina 5K (2019 - 2020) y PC compatibles : Amazon.es: Informática
How to Install Memory Into a 27-Inch Apple iMac (Late 2015 - 2020) iMac17,1 iMac18,3 iMac19,1 - YouTube
128.0GB (4 x 32GB) 2666MHz DDR4 PC4-21300 SO-DIMM 260 Pin OWC Memory Upgrade Kit - Macfixit Australia
OWC 768GB Memory Upgrade Kit for Mac Pro 2019 OWC29D4LR0768 B&H
OWC can double or quadruple the RAM in 27-inch iMac 5K | Cult of Mac