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  1. #1

    Member Since
    Mar 01, 2010
    iMac 27" 2.7 GHz 8GB Ram
    Adding memory in an iMac
    My iMac currently has two 512 MB cards installed. Can I replace just one of them with a 2GB card or do I have to use equal sized cards in each slot?
    On the website it indicates unequal size cards are okay, but I have also heard that the performance will suffer if they are not the same in both slots.

  2. #2

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    You should always install memory modules in matched pairs if possible. That will yield the best performance.

    NOTE: Your iMac can accept 4 GB of memory (2 x 2 GB modules), however, only 3 GB will be addressed.

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