Apple often lists a lower "official" maximum RAM than the machine can actually handle. iMac 2019 4k SSD and RAM Upgrade
Upgrading your iMac's RAM depends entirely on your specific model; while most have a simple hatch for user upgrades, 21.5-inch models and Apple Silicon (M1/M3) iMacs Go to product viewer dialog for this item. buy more ram for imac
: Click the Apple menu > About This Mac . Note the model name (e.g., " iMac Retina 5K, 27-inch, 2020 Go to product viewer dialog for this item. ") and the current memory type (e.g., "2666 MHz DDR4"). Check Upgradeability : 27-inch Intel iMacs (2012–2020) : These are the easiest to upgrade via a rear access door. 21.5-inch Intel iMacs Go to product viewer dialog for this item. Apple often lists a lower "official" maximum RAM