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  1. #1

    Member Since
    Oct 12, 2017
    Upgrading RAM on iMac Late 09
    I have a late 2009 iMac, 21.5", 3.06ghz intel core 2 duo with a measly 4 GB 1067 Mhz DDR3 ram (i bought it used a few years ago for like $250). As you can guess, processes are very bogged down.

    Anyway, i'm on wanting to upgrade my RAM with some OWC chips. I was wondering if it would be better to upgrade all 4 memory slots (4 gb each) for a total of 16 gb memory, which is the limit for this model--or if I should just go with two 4gb for the two open slots i have available. I suppose what i'm asking is if it will really make a huge difference in tasks from 12 gb to 16...

    Last edited by parrotfish; 10-12-2017 at 11:25 AM.

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac, i7 4GHz, 32GB memory, 1TB PCI-e storgae StOS X.13.3
    It will handle up to 16GB, which will be 4x4GB from Crucial or Owc.

    The biggest band for your buck will be a Solid State Drive if you are adventurous enough to do the job yourself. Go over to and look at their tear down for that model.

    And rememberGoogle is your friend!
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3

    deckape's Avatar
    Member Since
    Mar 22, 2010
    San Diego, Ca.
    iMac 21.5
    Just did this with my late 2009 iMac today. Ordered 2x4GB Corsair chips and installed them to total 12GB with fantastic results. Do it, you'll love it.
    Yachting, the greatest slow on earth.

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