HT201191: Install memory in an iMac
Learn about Install memory in an iMac
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Helpful answers
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Jan 8, 2014 10:07 PM in response to Mtauby mende1,Welcome to Apple Support Communities
You can use modules of different size if you want, but you may lose Dual Channel (this will not happen if you install 2 modules of 2 GB and 2 modules of 4 GB). However, it is important to use the same type of RAM, so you will not have issues with your Mac. This applies to all Macs.