iMac 21.5 (Mid 2011 model) RAM Upgrade

Discussion in 'iMac' started by rrawat02, Feb 13, 2013.

  1. rrawat02 macrumors newbie

    Jun 7, 2012
    Hi Guys,

    My iMac came with 4 GB RAM (2GB X 2) installed. My iMac has 4 slots and I'm currently using 2.

    On they claim I can leave in original 4 GB RAM and add two more 8 GB RAMs in the available slots. The final configuration will be--

    2 GB, 2 GB
    8 GB, 8 GB

    Total of 20 GB of RAM.


    1: claims the highest possible RAM for my iMac is 16 GB. Should I follow this recommendation and ignore
    2: The website says, "For the iMac (Mid 2010) and iMac (Mid 2011) models, use 2 GB or 4 GB RAM SO-DIMMs of 1333 MHz DDR3 SDRAM in each slot." They don't talk about 8 GB RAM option. Comments?
    3: I heard it was preferable to have identical RAM for each slot. Thoughts on that?


  2. Beaverman3001 macrumors 6502

    May 20, 2010
    I have a mid 2011 21.5in iMac with 20GB RAM right now (2x2x8x8) just like you are looking at, works fine. Apple only lists the amount they sell as the max for their computers.
  3. rrawat02 thread starter macrumors newbie

    Jun 7, 2012
  4. TrboMac macrumors regular


    Aug 8, 2012
    You can go up to 32GB of RAM on our model. I'm wanting to upgrade to at least 24 this year myself.
  5. toddzrx macrumors 6502a


    Nov 20, 2012
    How much RAM do you really think you need? I would start with that question.

    For what it's worth, I found a guy selling stock Apple RAM on Craigslist in my area: 2X2GB sticks for $20. I put those in my 2010 iMac, bumping it from 4 to 8GB, and the improved performance was small but noticeable (even after putting an SSD inside). So, modest upgrade for very little expense. At least in my case, I could go up to 16GB, but why? I have no need for that kind of performance. I'll wait for another couple of years when I need the performance, but the RAM is cheaper, to go above 8.
  6. RichMilo macrumors newbie

    May 31, 2013
    Oldish thread I know, but just confirming that I have the same model iMac with 32gb RAM installed, so yes you definitely can do it.

    It is a bit odd that Apple state 16gb as the max. It would be interesting to put four 16gb modules in just to see what happens.

    >> How much RAM do you really think you need? I would start with that question.

    As much as I can get. Trying running Photoshop, Premier and After Effects for an hour to see why!
  7. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    When Apple released the 2011 iMac, 8GB memory modules were rather hard to get ahold of. This is why they limited it to 16GB (4x4GB).

    The hardware in the machine would not see 16GB memory modules properly. It would other cap them at 8GB each or not work at all.
  8. dogslobber macrumors 68030


    Oct 19, 2014
    Apple Campus, Cupertino CA
    Yep, I've been running with 24gb for a few years now. Great machines are these computers. Even got one for my wife!
  9. Daniel Dionne, Mar 1, 2018
    Last edited: Mar 1, 2018

    Daniel Dionne macrumors newbie

    Daniel Dionne

    Mar 1, 2018
    --- Post Merged, Mar 1, 2018 ---
    Hi! There is no problem installing 2X8G Ram and 2G or 4G or 8G or what you want in the other slot Mid2011 but you are limited to 16 G Ram for Mid 2010.

    I heard that I can go to 64G Ram on a Mid 2011 I don"t know if you can on a mid 2010

    As i see on your configuration you have more ram 20G if it's a mid 2010 so I think you can go 32G

    Hope this will help you !

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