2019 27" iMac SSD Read/Write Speeds

Discussion in 'iMac' started by spiderpumpkin, Apr 28, 2019.

  1. spiderpumpkin macrumors regular

    Joined:
    Oct 27, 2014
    #1
    I just ordered a 512GB SSD with my i9 27" iMac but I'm wondering how much faster the 1TB SSD would be.

    What results are you getting when testing the 512, 1TB and 2TB SSD speeds with Blackmagic Speed Test?
     
  2. AppleFan360 macrumors 68020

    Joined:
    Jan 26, 2008
    #2
    On my 2TB SSD inside I'm getting around 2000 mb/s read and write.
     
  3. tyc0746 macrumors member

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    Apr 3, 2019
  4. hfg macrumors 68040

    hfg

    Joined:
    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
  5. bondavi macrumors newbie

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    Apr 4, 2019
    Location:
    Sacramento, CA
  6. rvivancoITA macrumors newbie

    rvivancoITA

    Joined:
    Apr 13, 2019
    Location:
    Switzerland
    #6
    Screenshot 2019-04-30 at 12.26.11.png

    i9 with 512Gb

    by the way, why do we have different values for the same GB of disk? I read above from another one that got a higher value than mine....
     
  7. mikehalloran macrumors 65816

    Joined:
    Oct 14, 2018
    Location:
    The Sillie Con Valley
    #7
    I’ve never seen two units test identically. As long as they’re within range, real world performance will be the same.
     
  8. macduke macrumors G4

    macduke

    Joined:
    Jun 27, 2007
    Location:
    Central U.S.
    #8
    My 2TB was around 2GB/s write and 2.5GB/s read. Pretty fast but I was hoping it would be at least as fast as the 2018 MBPs.
     
  9. miqui macrumors newbie

    miqui

    Joined:
    Sep 11, 2018
    #9
    Do you have any idea why iMac’s SSD is slower than those in MBP?
     
  10. mrvo macrumors member

    Joined:
    Nov 16, 2018
    #10
    T2 chip.

    iMac Pro raided SSD w/ T2 controller is the fastest at the moment.
     
  11. sterretje75, May 23, 2019
    Last edited: May 23, 2019

    sterretje75 macrumors newbie

    Joined:
    May 23, 2019
    #11
    I just bought a brand new 2019 iMac 5K, 27", 3,7 GHz i5 with 8 GB of RAM and a 512 GB SSD.

    Running Blackmagic Disk Speed Test gives an avg. write speed of 688 MB/s and a read speed of about 808 MB/s (see attached screenshot). I would have expected at least a factor 2 faster speeds.

    Anyone else experiencing these 'low' speeds?
    --- Post Merged, May 23, 2019 ---
    Oh wow... I just rebooted my iMac and now it reports the speeds I would expect :) Write of 1875 MB/s and read of 2523 MB/s.
     

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10 April 28, 2019