Mid 2013 MBA PCIe SSD Read & Write Speeds

Discussion in 'MacBook Air' started by gagecloutier, Jun 13, 2013.

  1. gagecloutier macrumors member

    Sep 21, 2012
    Today, I picked up one of the new base Haswell 11" MBAs. Absolutely love it so far. The drastically improved battery life in conjunction with the wickedly fast PCIe SSD makes it an excellent purchase. However, I noticed that my write speeds (315.2 MB/s) are significantly lower than my read speeds (719.0 MB/s). Usually write speeds are a little bit slower than read speeds, but not less than half. Anyone else who noticed this?
  2. jezzy macrumors member

    Jan 12, 2012
    Montreal, Quebec
    yup same here, seems the ssd on the 13" is better..!
  3. gagecloutier thread starter macrumors member

    Sep 21, 2012
    Hmm interesting. It doesn't make a monumental difference to me for how I plan to use it and exchanging it for a 13" MBA isn't an option for me... I want the 11" for portability! I'll wait and see if Apple addresses it. If not, I'm content.
  4. curtoise macrumors 6502a

    Apr 19, 2010
    OWC shows a test with the same issue on the 128SSD but there is a video on YouTube where they are testing a 256SSD and it is 700 read/write I guess the issue is with the 128?

    Speed test 256 sad

  5. Neeyul macrumors member

    Jun 13, 2013
    In the video test, both machines had the 128.

    Video in this thread:

  6. dlbmacfan macrumors regular

    Jul 20, 2011
    I'm getting 700+ read and write on my new 13" with 512GB.
  7. Supercherry macrumors newbie

    Jun 6, 2013
    The higher the capacity the higher the write speeds, this is true with all SSDs. The reason being there are more physical flash chips to spread the write load across.
  8. gagecloutier thread starter macrumors member

    Sep 21, 2012
    Wasn't aware of that, thank you! It's no real cause for concern then.
  9. sparkie7 macrumors 68020


    Oct 17, 2008
    Only if you have unused Space on the SSD though right? ie. if your 512 SSD is 500 full and you open a 10GB file your performance will be screwed
  10. sk3tch macrumors regular

    Oct 31, 2003
    It has nothing to do with 11" or 13" BTW...my 512GB 11" is rocking the 700MB+/sec speeds, as well.

  11. newdeal macrumors 68020

    Oct 21, 2009
    and my 13 128 has 400ish writes (also has samsung sad according to about my mac).
  12. sk3tch, Jun 17, 2013
    Last edited: Jun 17, 2013

    sk3tch macrumors regular

    Oct 31, 2003
    With that speed it must be the Sandisk.
  13. issiciby macrumors newbie

    May 16, 2010
    I am a 13 inch - i7, 8gb ram, 128fd user. I can confirm the 420/720 write/read speeds.
  14. newdeal macrumors 68020

    Oct 21, 2009
    says SM128F in the SataExpress area of about my mac which would indicate samsung
  15. sk3tch macrumors regular

    Oct 31, 2003
    Ah, must just be slower due to smaller size.
  16. nariza7 macrumors member

    Jun 16, 2013
    So the 256gb model and 512gb model on the 11.6 inch mac air have similar or vastly different write speeds? how similar/different if so?
  17. gloryunited macrumors 6502

    Oct 29, 2010
    So that means for 2013 MBA, the 128GB SSD is at 300-400/700, while the 256GB and 512GB are at 700+/700?

    It's the read speed that matters more right? Things like booting up, opening apps, waking from stand-by, etc.
  18. SpitUK macrumors 6502


    Mar 5, 2010
    East Yorkshire, UK
    Often with SSd's the 256/512 models are doubled up 128's. Hence you get the increased performance. Like the difference between single channel and dual channel.
  19. Neeyul macrumors member

    Jun 13, 2013
    Yeah, read speed is the more important one unless you're doing some crazy high-end multimedia encoding, in which case, you probably aren't going to be buying a MBA anyway. 4xx is hella fast for the 128s. (I got mine in this morning hoping to get one of the 7xx 128s, but didn't. I'm not bent, like I said, it's very quick for anything I would ever do, so I'm keeping it and not gambling on a return).
  20. torana355 macrumors 68030

    Dec 8, 2009
    Sydney, Australia
    The sequential read and write speeds from black magic mean diddly squat when it comes to system performance. What really matters is the random access IOPS rating.

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