iMac (Mid 2011): Memory specifications

Learn which kinds of memory to use with your iMac (21.5-inch, Mid 2011) and iMac (27-inch, Mid 2011).

The iMac (Mid 2011) computers have four SDRAM slots in the bottom of the computer and come with at least 4 GB DDR3 SDRAM installed as two 2GB DIMMs into two slots.

The maximum amount of RAM you can install in your computer is 16 GB (a 4 GB SO-DIMM in each slot).

You can use any Small-Outline dual inline memory modules (SO-DIMMS) that meet all of these criteria:

  • PC3-10600
  • Unbuffered
  • Nonparity
  • 204-pin
  • 1333 MHz

You can use RAM module sizes of 2 GB or 4 GB in each slot.

DIMMs with any of the following features do not work in the iMac (Mid 2011):

  • Registers or buffers
  • PLLs
  • ECC
  • Parity

Always follow the upgrade instructions for memory installation as written. Never attempt to remove any screws that are not listed in the upgrade instructions.

Additional Information

Learn about upgrading your iMac (Mid 2011) memory.

Last Modified: May 3, 2011
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