Overwhelmed, need help upgrading ram for iMac

Discussion in 'iMac' started by TonsOfFun420, Jul 16, 2017.

  1. TonsOfFun420 macrumors member

    May 10, 2012
    Hello all, I have a 2011 27" iMac with the stock ram (two 2gb for a total of 4gb) and I want to install more ram. I am a noobie at this stuff and am overwhelmed by the info I find when googling the proper way to do this. I have this ram is it the correct ram to use? And is it ok to mix with the stock ram already in the iMac?

    Thanks in advance.
  2. cynics, Jul 16, 2017
    Last edited: Jul 16, 2017

    cynics macrumors G4

    Jan 8, 2012
    Upgrade in matching pairs. I would recommend Crucial 8gb or 16gb kit. "Officially" your Mac supports 8gb of RAM however in reality it supports 16gb.

    This link here will have 8gb and 16gb kits available. Kit is just the memory being sold in matching pairs.

    You can use cheaper RAM and it could work just fine. I just prefer Crucial in an iMac because I've had good luck with it.

    EDIT: I "thought" 8gb was the official limit but 16gb worked fine. 16gb is even verified by Apple. However the users post below mine is using 32gb which Sandy Bridge does support....
  3. Erdbeertorte, Jul 16, 2017
    Last edited: Jul 16, 2017

    Erdbeertorte Suspended

    May 20, 2015
    At the moment I am using a combination of 2 x 8 GB 1.066 and 2 x 8 GB of self overclocking (2.133 MHz) 1.333 MHz RAM.

    It's working without any issues but of course only at 1.066 MHz, but 32 GB in total.

    Also 2 x 4 GB 1.333 instead of the first mentioned mixed with the others is working fine and it goes up to 1.333 MHz for everything, but only 24 GB.

    And the stock 2 x 2 GB worked too together with the "2.133 MHz" ones and the other brand 8 GB 1.066 MHz.

    Even all three in combination work.

    So I think every DDR3-SO-DIMM not larger than 8 GB per module with max. 1.333 MHz native speed should work, even with faster ones if you manage to find the correct slot combination to slow down the not supported speed modules.

    It could also be that you get beeps because the timing does not match, then you just need to switch the slots too.

    Strangely my Late 2011 MBP is able to run that self overclocking memory at full speed with 2.133 MHz but my Mid-2011 27" iMac not if I only put those two in it.

    Screen Shot 2017-07-16 at 19.50.59.png

    Edit: Just found a bug. There is no Early 2011 27" iMac, in the betas before it was shown correctly as Mid-2011.

    Screen Shot 2017-07-16 at 19.50.52.png

    This is the best source if you want to upgrade your Mac:


    Edit Number 12: I hope you read it after it was finished. :oops: My concentration is not the best at the moment.
  4. youngchek macrumors newbie

    Sep 9, 2017
    I'm newbies in iMac upgrade thingy. Would like to know, for iMac mid 2017, 27" 4.2GHz model, if I order from Apple with upgrade to 32GB RAM, what RAM config they give? 2x16GB or 4x8GB?

    Appreciate someone can enlighten me.

    PS: I need to order 32GB due to company's internal purchasing needs and upgrade to 64GB DIY.

    Thanks in advance.
  5. MadDane macrumors 6502a

    Apr 5, 2015
    They will (unfortunately) give you 4x8 GB
  6. youngchek macrumors newbie

    Sep 9, 2017

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