MacBook Pro + Samsung Evo 840 SSD = Slow read/write speeds?

Discussion in 'MacBook Pro' started by Jholder112233, May 10, 2014.

  1. Jholder112233 macrumors newbie

    Aug 25, 2010
    Hi everyone,

    Just looking for some advice. I installed a 256GB Samsung Evo 840 SSD in my 2010 MacBook Pro yesterday and did a clean install of OS X Mavericks.

    I've just done a read/write test using the Blackmagic disk utility and I've realised my speeds are much slower than expected.

    Read tops out at around 260MB/s and write at around 255MB/S.

    Any tips on what I can try to up them? I've enabled trim.

  2. berker macrumors newbie

    May 10, 2014
    Nope the SSD speed on your device is correct. Since you are using SATA 3 Gbps connection there is a speed off.

    If you would have SATA 6 Gbps bus then you would have full speed that the SSD offers.
  3. yjchua95 macrumors 604

    Apr 23, 2011
    GVA, KUL, MEL (current), ZQN
    No you can't. Your MBP has a SATA2 3Gb/s connection, so you can only get around 250-300MB/s.
  4. bobcan macrumors 6502a


    Jan 8, 2007
    Sunny but Cold.. Canada
    You have effectively made an older, slower, computer 'faster' I should hope, but not nearly at speeds the new component could be used at.. :apple:
  5. Marty62 macrumors 6502

    Mar 11, 2010
    Berlin formerly London
    That's SATA II speeds BUT you have increased your data transfer speeds
    by at least 3 X what a normal HDD can do !!

    Still was a great move so be happy :)

  6. maxwell5050 macrumors newbie

    Apr 22, 2014
    Never used an Evo but I had a single 840 Pro 512 in my Mac Mini and would average about 400 MB/s.

    I recently got a second drive and put them in a RAID 0 (after some serious resistance from Mavericks).

    Now this is what I'm getting......


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