2019 Imac 27 3.7 - Memory add caused crashing "

Discussion in 'iMac' started by GPD-AZ, Aug 15, 2019 at 8:06 AM.

  1. GPD-AZ macrumors newbie

    Joined:
    Thursday
    Location:
    Phoenix, AZ
    #1
    I have a 2019 27" 3.7 iMAC. I bought it with 8 gig onboard.

    I purchased the recommended OWC 16 x 2 DDR4s.

    1. When I added the 16g to each of the available slots (and expected 40G), the machine would not boot.
    2. I removed the 2 4G and replaced each with a 16. Machine booted fine. Memory showed OK in diagnostics. Performed well.

    Each time the iMAC slept or even went to screen saver, it would crash and reboot. I called Apple support and went through the safe boot process and did a bunch of "delete app, install app" and "log out/login" stuff. Problem did not go away.

    This morning, I removed the 32G and put the 8G back in. Problem gone.

    Thoughts? Thanks!

    OWC 32GB (16GBx2) DDR4-2666 Kit
     
  2. whosthis macrumors member

    Joined:
    Aug 21, 2008
    #2
    Return them. They seem to be faulty. Unfortunately, I've read this more than once on the forum here for OWC memory. They are great at marketing. Quality - not so much.

    If you can get a refund, I'd take it and get modules from a manufacturer. Not some dubiously rebranded and recolored ones.
     
  3. GPD-AZ thread starter macrumors newbie

    Joined:
    Thursday
    Location:
    Phoenix, AZ
    #3
    Roger that and thanks for the validation. Good news is I bought through Amazon and return is no problem. I'm sure there are dozens of threads on preferred memory. Crucial? Other?
     
  4. whosthis macrumors member

    Joined:
    Aug 21, 2008
    #4
    I am happy with my Samsung, but others may be fine, too. Look around on this board, there are a couple of threads discussing this.
     
  5. 28Gauge macrumors 6502

    28Gauge

    Joined:
    Sep 4, 2011
    Location:
    DFW
    #5
    I ordered Crucial 16GB x2 RAM from Amazon for my 2019 i9 iMac. No issues at all after installation.
     
  6. GPD-AZ thread starter macrumors newbie

    Joined:
    Thursday
    Location:
    Phoenix, AZ
    #6
    Thanks! I RMA'd the memory and bought some new. I'll see how that works on Saturday. I appreciate the community!
     
  7. Rumpot macrumors newbie

    Joined:
    May 25, 2012
    #7

    I had the same issue with the recommended OWC 16 x 2.
    Found out it didn't like not being in the same bank, so I placed them together and it been working great.
    i.e. view from the back
    --owc16
    --apple4
    --owc16
    --apple4
    This configuration did not work for me and I got the same symptoms as you.
    If I used either the stock apple ram or just the owc it worked great
    Switched to this
    --owc16
    --owc16
    --apple4
    --apple4
    and this is working for me for all 40GB
     

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6 August 15, 2019