Can't find compatible RAM for iMac 2019

Discussion in 'iMac' started by baryon, May 26, 2019.

  1. baryon, May 26, 2019
    Last edited: May 26, 2019

    baryon macrumors 68040


    Oct 3, 2009
    So I thought this was going to be easy, I'll go to and type in "iMac 2019". Except they don't have any compatible RAM for this machine.

    So I'm like... okay, I'll just search manually! Let's see the list for Mac computers... There isn't a single one that's 2666 Mhz.

    Okay, don't panic, surely other brands have RAM like that... Kingston does... Except I have bought 4 Kingston drives in the past and every single one of them have failed. So I will not buy anything from them again.

    What else is there? I'm seeing this, which is the Corsair DDR4 2666 32GB Vengeance RGB PRO CL16 KIT (2x16GB). Will this work?

    Apple says this about compatible RAM:
    " Use Small Outline Dual Inline Memory Modules (SO-DIMM) that meet all of these criteria:
    • PC4-21333
    • Unbuffered
    • Nonparity
    • 260-pin
    • 2666MHz DDR4 SDRAM"
    How am I supposed to know if they match all this criteria? No website ever talks about memory being unbuffered, nonparity, and the PC4-21333 thing. I have no idea what they mean. The only info about the RAM is that it's DDR4 and 2666 MHz, that's all. And based on the photo I can tell it's likely the right size, though I don't know how to be sure.

    Then there's this on Amazon, except it's "PC4-21300" and not "PC4-21333". I also can't tell if it's unbuffered and whether if it has nonparity. Whatever that means.

    I thought this was going to be easy.

    Can you recommend me 2x16GB of RAM for the iMac 2019 that's available in Europe? Ideally from a good brand? Thanks!
  2. PBMB macrumors regular

    Mar 19, 2015
    There is OWC. They are U.S.-based but they ship in Europe, so I guess you will have to consider VAT also.
  3. priitv8 macrumors 68040

    Jan 13, 2011
    Amazon must have incorrect data. This kit is exactly the one to get!
    Works like a charm on mine! As a matter of fact, both this RAM and the 8GB that came from Apple, are produced by Micron.
    And the price is soooo-right :D
    IMG_1391.jpg IMG_1392.jpg Screenshot 2019-05-26 at 20.14.08.png
  4. marzfreerider macrumors member

    Jun 13, 2014
    The Crucial RAM posted by pritv8 does work with the 27" 2019 iMac. I've been running 64GB of this since April 5 with no issues so far (as have a lot of others). Usually if you type more specific info into Amazon, it will give you more info of the type of RAM you are looking for. Also scroll down the page as it usually tells you more info on specs. I find most times it is in the main listing wording. Personally I have always had good luck with Kingston RAM. Used it for many iMacs over the years with no issues. Only reason I didn't get Kingston this time was I couldn't find any in stock, was a 1-3 month wait at the time. This is the first time I have ever used Crucial and did so as it is usually highly recommend from most tech sites including the forums here. So far very happy with it. Good luck.
  5. AlaskaMoose, May 26, 2019
    Last edited: May 27, 2019

    AlaskaMoose macrumors 68000

    Apr 26, 2008
    Same for me. What I did was to leave the two 4GB sticks apple RAM as installed by Apple, and placed the two 2x16GB Crucial RAM that I bough from Amazon in the two empty slots. Also, since I have replaced RAM sticks of other Mac computers, I already knew that one has to carefully push the sticks into each slot only when perfectly aligned and level. The last step is push it firmly in place until it bottoms-out.
  6. PBMB macrumors regular

    Mar 19, 2015
    And this brings naturally the question: why does it take so long for Crucial to officially offer memory upgrades for the new iMac in their main web site? I don't understand.
  7. spiderpumpkin macrumors regular

    Oct 27, 2014
    I bought two 4GB sticks of Sk Hynix DDR4 2666 RAM, that someone took out of there 2019 iMac, for $20 shipped. So now I have 4x4GB.

    Having 16GB is plenty to start and I may eventually buy 4x8GB or 4x16GB once prices come down even more.
  8. AlaskaMoose macrumors 68000

    Apr 26, 2008
    No idea why. Now, since the RAM is being sold to the PC market the price for it must be low enough to compete with other PC RAM being sold. But since the "word of mouth" goes a long way in the market, a lot of people are buying this RAM from Amazon and then recommending it for the Mac as well as PC, Crucial is selling more RAM because of its lower price compared to other RAM that is warranted for the Mac. Crucial could have someone (s) testing the RAM with Apple computers, but that would make it more expensive.

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8 May 26, 2019