The M1 iMac 24-inch locks its 16GB of RAM at the factory

The M1 iMac 24-inch tops out at 16 GB of unified memory, configured at purchase and sealed forever. There’s no 32 GB option on this model — a limitation that surprised some buyers when it launched. For an all-in-one aimed at families and office work, 16 GB is fine. For anything more demanding, you’d want one of the Pro models.