The iMac (Mid 2007) computer has two Synchronous Dynamic Random-Access Memory (SDRAM) slots in the bottom of the computer. It comes with at least 1 GB Double Data Rate (DDR2) SDRAM installed in a single slot. The maximum amount of random-access memory (RAM) you can install in the machine is 4 GB: 2 GB Small Outline Dual Inline Memory Module (SO-DIMM) in each slot.
You can use SO-DIMM memory that meets all of these criteria:
- 667 MHz DDR2 SDRAM
You can use RAM module sizes of 1 or 2 GB in each slot.
DIMMs with any of the following features are not supported:
- Registers or buffers
- Error-correcting code (ECC)
- Extended data out (EDO) RAM
Always follow the upgrade instructions for memory installation as written. Never attempt to remove screws that are not listed in the upgrade instructions.
For more information about upgrading the memory in your iMac (Mid 2007), see this article.