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Chapter 4 Explore iMac 40
Replace memory
Overview
You can replace memory in the 27-inch iMac by following the instructions in this section.
Important: 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 specications:
•
PC3-15000
•
Unbuered and nonparity
•
204-pin 1867 MHz DDR3 SDRAM
WARNING: Apple recommends that you have an Apple-certied technician install memory. See
Learning more, service, and support 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.
Install memory
The 27-inch iMac has four memory slots. Two are lled with at least a 4 GB memory module. You
can install additional memory in the free slots or replace the memory in the lled 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.
WARNING: 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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