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  1. #1

    Member Since
    Apr 24, 2012
    Useful Ram Question
    Hi All,

    I have a late 2009 iMac which has as standard 2 X 2Gb or ram installed.

    I am looking to upgrade to 2 X 4Gb but I have been told it will only actually use 2Gb and would not use the remaining 2Gb on each card?

    Is this correct or not?


  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
    If you own a late 2009 iMac, it must either be a 21.5" or 27" model. In which case the maximum amount of memory for both machines is 16 GB.

    However, the early and mid 2009 models all have a maximum memory of 8 GB. So which model do you have?

    In any event which ever model you own, you can use 2 x 4 GB modules for a total of 8 GB. All the info I provided here is taken from Mactracker which is usually correct.

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