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  1. #1


    Member Since
    Feb 13, 2007
    Location
    Worthing, West Sussex, UK
    Posts
    217
    Specs:
    27" iMac 3.1Ghz 16GB RAM, 1TB HD. iPhone 4.
    Question RAM Upgrade Question
    I've just bought a new iMac which came with 4GB of RAM but I want to upgrade it to at least 8GB and ideally 16GB (apparently the maximum it supports even though there are 4 slots each of which support 8GB DIMMS).

    I wondering if there is any performance difference in using just 2 memory banks or all 4?

    If I upgrade to 8GB should I buy 2 more 2GB DIMMS or replace the existing RAM and replace with 2x 4GB DIMMS?

    If I upgrade to 16GB should I use 2x 8GB or 4x 4GB DIMMS?

    Or does it not matter?

  2. #2


    Member Since
    Apr 20, 2010
    Posts
    472
    Specs:
    21.5 iMac 3.06 ghz 12gb ram 500g HD iPad 2 16G
    Matching pairs top and bottom...any combination...just matching.

  3. #3


    Member Since
    Feb 13, 2007
    Location
    Worthing, West Sussex, UK
    Posts
    217
    Specs:
    27" iMac 3.1Ghz 16GB RAM, 1TB HD. iPhone 4.
    Quote Originally Posted by codda View Post
    Matching pairs top and bottom...any combination...just matching.
    Cheers Codda. Have ordered now 4x4GB as this was massively cheaper than 2x 8GB

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