How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
OWC can double or quadruple the RAM in 27-inch iMac 5K | Cult of Mac
OWC: 128 GB RAM im iMac 2019 nun möglich - Macwelt
Amazon.com: OWC 256GB (2 x 128GB) PC23400 DDR4 ECC-R 2933MHz LRDIMMs Memory Compatible with Mac Pro 2019 and up Models (OWC29D4LR0256) : Everything Else
Amazon.com: OWC 128GB (2 x 64GB) PC23400 DDR4 ECC-R 2933MHz RDIMMs Memory Compatible with Mac Pro 2019 and up Models (OWC2933R6M128) : Everything Else
Memory Upgrades for 2019-2020 iMac 27-Inch - Up to 128GB
OWC Announces 128GB RAM Upgrade for 2019 27-inch iMac Retina 5K • iPhone in Canada Blog
128GB Memory Upgrade for 2019-2020 Apple iMac (27-Inch)