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Explore iMac 

Replace memory

You can replace memory in the 27-inch iMac by following the instructions in this section.

The memory in the 21.5-inch iMac is not user-replaceable and can’t be upgraded 

after purchase. The 21.5-inch iMac can have a maximum of 16 GB of memory installed. Do not 
attempt to open your 21.5-inch iMac to replace or upgrade its memory. 

Your 27-inch iMac comes with at least 8 gigabytes (GB) of 1867 MHz DDR3 memory installed as 
two 4 GB memory modules. You can replace or install additional 4 GB or 8 GB memory modules 
for up to a maximum of 32 GB. Use Small Outline Dual Inline Memory Modules (SO-DIMM) that 
meet all the following specifications:

 

•

PC3-15000

 

•

Unbuffered and nonparity

 

•

204-pin 1867 MHz DDR3 SDRAM

Apple recommends that you have an Apple-certified technician install memory. See 

 for information about how to contact Apple for service. If 

you attempt to install memory and damage your equipment, that damage isn’t covered by the 
limited warranty on your iMac.

The 27-inch iMac has four memory slots. Two are filled with at least a 4 GB memory module. You 
can install additional memory in the free slots or replace the memory in the filled slots with 2 GB, 
4 GB, or 8 GB memory modules, for up to 32 GB of memory.

You can purchase additional memory from an Apple Authorized Reseller.

Always shut down your iMac and remove the power cord before installing memory. 

Do not attempt to install memory while your iMac is plugged in. If you’ve been using your 
iMac, wait ten minutes after shutdown to let the internal components cool before continuing.

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