iMac Memory Upgrade

Discussion in 'iMac' started by MementoMori5, Dec 22, 2013.

  1. MementoMori5 macrumors newbie

    Sep 10, 2012
    I have a late 2009 27 inch iMac, and I would like to upgrade my memory. I was wondering which company, and specifically which model memory everyone would recommend?
  2. Brian33 macrumors 6502a

    Apr 30, 2008
    USA (Virginia)
    Well, you'll need to know the memory specs first. Look up your machine on I see two that fit your description, a 3.06 GHz and a 3.33 GHz model. The former specifies RAM as follows:

    RAM Type: PC3-8500 DDR3
    Min. RAM Speed: 1066 MHz
    Details: Supports 1066 MHz PC3-8500 DDR3 SO-DIMMs (204-pin).

    Then I'd also go to one of the big manufacturer's websites (like or and use their memory selection tool to make sure its recommendations match up with as far as the specs.

    For brands, I've had good luck with OWC, OCZ, and Patriot and bad luck with PNY, for what that's worth.

    You might get more responses if you add "late 2009 27 inch iMac" to the thread title...
  3. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    I have the same model iMac and added Crucial memory when I got the iMac. I've had no problems with the memory.
  4. MementoMori5 thread starter macrumors newbie

    Sep 10, 2012
    I have a 2.8 GHz Intel Core i7 Processor. 8GB 1067 MHz DDR3 memory. ATI Radeon HD 4850 512 MB Graphics. It says currently all 4 memory slots are in use with 2gb each. Each one accepts a 1067 MHz DDR3 memory module.
  5. DeltaMac macrumors G3


    Jul 30, 2003
    Each slot can take either 2, 4 or 8GB - so with all slots filled now, you would remove whatever you are upgrading.
    I like OWC or Crucial, and often use Kingston. Any that have a lifetime warranty is a good choice.
    An advantage for OWC is the rebate - they will buy your old RAM, so would drop the cost.

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