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iMac (21.5-inch and 27-inch, Late 2012): Memory specifications

Learn which kinds of memory to use with your iMac (21.5-inch, Late 2012) and iMac (27-inch, Late 2012).

iMac (21.5-inch, Late 2012)

iMac (21.5-inch, Late 2012) computers have two internal SDRAM slots inside the computer. The computer comes with at least 8 GB DDR3 SDRAM installed as two 4 GB DIMMs into two slots. The maximum amount of RAM the computer supports is 16 GB (an 8GB SO-DIMM in each slot).

You can configure your iMac (21.5-inch, Late 2012) with the amount of SDRAM you'd like when you're ordering it. Installed RAM module sizes can be 4 GB or 8 GB in each slot.

The memory DIMMs for iMac (21.5-inch, Late 2012) computers are not user-accessible. Visit an Apple Retail Store or Apple Authorized Service Provider if you need to replace your iMac (21.5-inch, Late 2012) computer's DRAM.

 

iMac (27-inch, Late 2012)

iMac (27-inch, Late 2012) computers have four SDRAM slots in a compartment located on the rear of the computer. The computer comes with at least 8 GB DDR3 SDRAM installed as two 4 GB DIMMs into two slots. The maximum amount of RAM you can install in your computer is 32 GB (an 8 GB SO-DIMM in each slot). 

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

  • PC3-12800
  • Unbuffered
  • Nonparity
  • 204-pin
  • 1600 MHz
  • DDR3 SDRAM

You can use RAM module sizes of 4 GB or 8 GB in each slot. 

DIMMs with any of the following features do not work in iMac (27-inch, Late 2012) computers:

  • Registers or buffers
  • PLLs
  • ECC
  • Parity
  • EDO RAM

Always follow the upgrade instructions for memory installation. See iMac (27-inch, Late 2012): Installing or Replacing Memory for complete details. 

 

Last Modified: Dec 20, 2012
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  • Last Modified: Dec 20, 2012
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