Does my 2018 MacBook Pro 15" 512GB have slow SSD speeds?

Discussion in 'MacBook Pro' started by incurma, Aug 15, 2018.

  1. incurma macrumors newbie

    Aug 8, 2018
    Expected (as advertised on Apple's website):

    Write: 3000 MB/s (give or take)
    Read: 2600 MB/s (at least)

    Actual (tested using Black Magic):

    Write: 1600 MB/s
    Read: 2600 MB/s

    Is anybody else experiencing something similar? What are your SSD write/read speeds?

    There seems to be a community discussion about this as well:
  2. jerryk, Aug 15, 2018
    Last edited: Aug 15, 2018

    jerryk macrumors 601

    Nov 3, 2011
    SF Bay Area

    I see the same numbers you are. System is as below.

    It would be great for someone to run BlackMagic on a 13" 512 and see what speeds they are seeing.
  3. Brookzy macrumors 601


    May 30, 2010
    What disk size?

    This was Apple's test, you could try to replicate it (someone else will have to advise how though... :p)
  4. incurma thread starter macrumors newbie

    Aug 8, 2018
    My machine has a 512GB SSD (I cannot believe that I forgot to include that!)

    Thread title has been updated as well...
  5. L-5Jazzman macrumors newbie

    Nov 12, 2015
    Ours writes about 1600 too. Stock 15" 2.6 version.
  6. terraphantm macrumors 68040

    Jun 27, 2009
    Larger disks are generally faster than slower ones. The 512 is probably just legitimately slower.
  7. wangqi macrumors newbie

    Sep 6, 2018
    Yes, have been stuck in such issue. But luckily to solve it ,here i am glad to share the methods with you.Hope it caan help you.
    First, disable Hibernation:
    The Hiberfil.sys file almost take a same amount of space as the random access memory (RAM). So it is better to disable it when your SSD runs very slow:
    enter the command prompt window by clicking the Start button and type cmd (please run as administrator), and type command powercfg.exe /hibernate off and press Enter.
    Seond, make SATA controller runs in AHCI mode
    AHCI (Advanced Host Controller Interface) Mode does a fabulous job of keeping the high performance of solid state drive. So when it is disabled, the SSD might run slow and take a very long time to respond. It is better to set your SSD mode from IDE to AHCI.
    1) Press WIN+R and type msconfig and then press Enter.
    2) Under Boot tab, tick Safe boot, click OK to save the changes, and reboot your computer into safe mode by constantly pressing F2 or DEL. Change your SATA mode from IDE to AHCI. Then save settings to exit and reboot.
    3) Windows will boot in safe mode this time. Run msconfig again, and untick Safe boot option Boot tab under and restart your computer.
    If you tried these two methods but the problem still unsolved, you can try to align SSD partitions to improve the performance, or completely erase the disk to restore its peak performace, to get rid of ssd slowing down.
  8. maflynn Moderator


    Staff Member

    May 3, 2009
    Mine appear to be in that neighborhood as well. ¯\_(ツ)_/¯
  9. satysin macrumors member

    Jul 30, 2018
    My 1TB gets ~2690MB for both read and write. I believe the speeds you are seeing are right for the 512GB model.
  10. Fishrrman macrumors P6


    Feb 20, 2009
    How to completely disable "hibernation mode" and lock the sleep image' size:

    First, disable hibernation mode :
    sudo pmset -a hibernatemode 0

    Delete the existing sleep image:
    sudo rm /private/var/vm/sleepimage

    Create an empty file and name it 'sleepimage' :
    sudo touch /private/var/vm/sleepimage

    Finally, change its flag to immuable :
    sudo chflags uchg /private/var/vm/sleepimage

    Now, OS X won't be able to rebuilt over your sleepimage file since it is locked.
  11. maflynn Moderator


    Staff Member

    May 3, 2009
    What does this have to do with 512GB SSD performance :confused:
  12. Fishrrman macrumors P6


    Feb 20, 2009
    maflynn wrote:
    "What does this have to do with 512GB SSD performance"

    I was replying to something written in reply #7 above.
    I didn't quote it in my post.
  13. poorcody macrumors 6502a


    Jul 23, 2013
    These instructions are for Windows, not a Mac.
  14. AppleHater macrumors 6502a

    Jun 9, 2010
    My latest 512GB SSD on my brand new 13inch 2018 MacBook Pro has the same 1,800 number which is nothing to sneeze about but certainly not 2,600 number that other sizes get. It'll be upsetting if 256GB gets a faster speed, although that's too small of space to work with for me.
  15. IngerMan macrumors 65816


    Feb 21, 2011
    My 2017 500GB 15" is 1800's Write 2100's Reads. I believe the 1TB would be faster as apple reports.

    MBP15" 500GB.png
  16. AndreCouture macrumors newbie

    Dec 23, 2018
    Mine is even worst! Did is also 500GB Flash Storage (as reported by Apple Storage tab)
    Bench ran at 5GB size. If I run at 2GB I get better results... so which one would be more accurate?

    Screenshot 2018-12-23 11.14.34.png
  17. Cuda392 Suspended

    Dec 22, 2018
    Apple advertises the speeds for the higher tiers of the SSD and not the lower to make it look good. The 2tb and 4tb perform the speeds they advertise just not the lower ones.
  18. upandown macrumors 6502a

    Apr 10, 2017
    Another one of these threads...

    The speeds the OP posted are EXACTLY what you should be getting for the 512gb size. Nothing you do will change that.
  19. Dominus Mortem macrumors regular

    Aug 3, 2011
    I'm not in front of my 2018 15" right now so I'll just report what my 2017 13" 256 is getting: 1300 write / 2400 read. Seems to keep this number no matter the file size chosen.

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18 August 15, 2018