New SSD very slow

Discussion in 'iMac' started by DontDuckWithMe, Mar 9, 2015.

  1. DontDuckWithMe macrumors newbie

    DontDuckWithMe

    Joined:
    Feb 12, 2015
    #1
    Hi,

    Today I replaced the superdrive of my late 2009 iMac with a Samsung 850 Evo SSD thinking I could bring it back to life but I soon noticed that the speed is basically identical to that of the HDD.

    Now, I know the connector is an old Sata II so I wasn't expecting crazy speeds, but 130 mb/s both write and read seems a little bit slow to me, considering I've also done a clean install of OS X...

    There must be some kind of problem, right? I thought my mac could reach at least 230 mb/s with a decent SSD.
     
  2. kepler20b macrumors 6502

    Joined:
    Oct 18, 2014
    #2
    nah

    Odds are that you are either bottlenecked by your RAM or CPU.
     
  3. DontDuckWithMe thread starter macrumors newbie

    DontDuckWithMe

    Joined:
    Feb 12, 2015
  4. matreya macrumors 65816

    matreya

    Joined:
    Nov 14, 2009
    #4
    Try swapping your SSD and HDD around and see if that improves the speed of the SSD.
     
  5. briand06 macrumors newbie

    briand06

    Joined:
    Feb 20, 2012
    Location:
    Italy
    #5
    It might be. The speed of the mechanical HD of my 2008 iMac is twice than yours.
     

    Attached Files:

  6. kepler20b macrumors 6502

    Joined:
    Oct 18, 2014
    #6
    what is your random read/write speeds? 130mb/s read/write speeds are slow for an SSD but that only pertains to moving large files. Random read/write speeds essentially dictate everything else you need your HD for.

    benchmark it and show us your random read/write.
     
  7. DontDuckWithMe thread starter macrumors newbie

    DontDuckWithMe

    Joined:
    Feb 12, 2015
    #7
    You mean this?

    [​IMG]
     
  8. phpmaven macrumors 68040

    phpmaven

    Joined:
    Jun 12, 2009
    Location:
    San Clemente, CA USA
    #8
    If those are your SSD numbers, then something is wrong. You should be getting 3 or 4 times those numbers.
     
  9. Bruno09, Mar 10, 2015
    Last edited: Mar 10, 2015

    Bruno09 macrumors 68020

    Joined:
    Aug 24, 2013
    Location:
    Far from here
    #9
    3 or 4 times : no. This iMac has a SATA 2 interface.

    For example on a Late 2009 Macbook (SATA 2 too) with a Crucial MX100 256 Go I get :

    Write : 230 MB/s
    Read : 260 MB/s

    (for info : 400 and 490 MB/s on a Macbook Pro Early 2011 SATA 3, Crucial M500 480 Go)
     
  10. drambuie macrumors 6502a

    Joined:
    Feb 16, 2010
    #10
    Follow matreya's advice, and swap the drives. It looks like the superdrive port is limited to negotiating at SATA 1 speeds. If the HDD port negotiates with the SSD at SATA 2 speeds, then the benchmark readings should be approximately double your present readings.
     
  11. DontDuckWithMe thread starter macrumors newbie

    DontDuckWithMe

    Joined:
    Feb 12, 2015
    #11
    I don't know how safe it is to do something like this:

    [​IMG]

    But it worked, I think :D

    [​IMG]


    Of course, I'll buy some kind of proper adapter for the SSD :eek:
     
  12. Bruno09 macrumors 68020

    Joined:
    Aug 24, 2013
    Location:
    Far from here
    #12
    Much better :D

    Double sided tape is fine for SSDs in iMacs.
     
  13. kepler20b macrumors 6502

    Joined:
    Oct 18, 2014
    #13
    safe imo.

    I used velcro once in my PC.


    Is the mac quicker now?
     
  14. phpmaven macrumors 68040

    phpmaven

    Joined:
    Jun 12, 2009
    Location:
    San Clemente, CA USA
    #14
    I stand corrected.
     

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