Slow OWC Mercury Extreme SSD Pro?

Discussion in 'Mac Pro' started by Mac Hammer Fan, Mar 5, 2014.

  1. Mac Hammer Fan, Mar 5, 2014
    Last edited: Mar 5, 2014

    Mac Hammer Fan macrumors 6502

    Mac Hammer Fan

    Joined:
    Jul 13, 2004
    Location:
    Belgium
    #1
    I tested the speed of my drives with Black Magic SpeedTest
    OWC SSD 240GB:
    [​IMG]
    Internal Harddrive Seagate 3TB:
    [​IMG]
    Is this test accurate?
    Although the results of my SSD are worse than these of the harddisk, the SSD disk boots faster.
    Would reinitialize the SSD improve the results?
    Here are the results from my new Accelsior 480GB SSD. Read speeds are here also below these promised on OWC's website, but I can live with that.
    [​IMG]
    TIA
     
  2. Mac Hammer Fan, Mar 5, 2014
    Last edited: Mar 5, 2014

    Mac Hammer Fan thread starter macrumors 6502

    Mac Hammer Fan

    Joined:
    Jul 13, 2004
    Location:
    Belgium
    #2
    I erased the OWC Mercury SSD but it didn't help. Read and write speeds are still slower than a conventional hard drive, according to BlackMagic Disk SpeedTest. :confused:
    Would Trim Enabler help?
    http://www.cindori.org/software/trimenabler/
     
  3. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #3
    TRIM won't help reads.
     
  4. kwarwick43 macrumors member

    Joined:
    Aug 11, 2008
    #4
    Those read and write speeds are very poor for a SSD. How is the OWC SSD attached?
     
  5. Mac Hammer Fan thread starter macrumors 6502

    Mac Hammer Fan

    Joined:
    Jul 13, 2004
    Location:
    Belgium
    #5
    This SSD performed better in the beginning, I guess. It worked well when I bought it 3 years ago. It starts up fast. It is installed with an Icy Dock in the 4th drive bay of my Mac Pro. (Sata II)
    When running XBench, I get the same results as in the beginning:
    Results 342.95
    System Info
    Xbench Version 1.3
    System Version 10.9.2 (13C64)
    Physical RAM 16384 MB
    Model MacPro5,1
    Drive Type OWC Mercury Extreme Pro SSD
    Disk Test 342.95
    Sequential 212.24
    Uncached Write 313.26 192.34 MB/sec [4K blocks]
    Uncached Write 286.62 162.17 MB/sec [256K blocks]
    Uncached Read 106.25 31.09 MB/sec [4K blocks]
    Uncached Read 363.09 182.49 MB/sec [256K blocks]
    Random 892.82
    Uncached Write 1602.09 169.60 MB/sec [4K blocks]
    Uncached Write 415.54 133.03 MB/sec [256K blocks]
    Uncached Read 2919.82 20.69 MB/sec [4K blocks]
    Uncached Read 903.34 167.62 MB/sec [256K blocks]
    Of course it's not as fast as the Accelsior that I just bought.
     
  6. Mac Hammer Fan thread starter macrumors 6502

    Mac Hammer Fan

    Joined:
    Jul 13, 2004
    Location:
    Belgium
    #6
    I did some real world tests: I copied a 36 GB File
    to the 3TB hard disk: 8 min
    to the OWC Mercury Extreme SSD: 4 min
    to the Accelsior SSD: 3 min
    Therefore, in real world tests the OWC Extreme SSD doesn't perform that bad.
    It boots very fast too. But the Black Magic Disk Speed Test results are bad.
    I wonder whether they are accurate and reliable...
     
  7. xcodeSyn macrumors 6502a

    Joined:
    Nov 25, 2012
    #7
    No, it's not accurate as explained here. Blackmagic test is quite meaningless for Sandforce-based SSDs, and Xbench is a better one as you already found out.
     
  8. Mac Hammer Fan thread starter macrumors 6502

    Mac Hammer Fan

    Joined:
    Jul 13, 2004
    Location:
    Belgium
  9. Tangu macrumors newbie

    Joined:
    Jun 21, 2010
    #9
    UP for this post.

    I tough my SSD was bad, but with Xbench it is okay performance with SATA 2 that i have with my mac pro.

    I'll check if i can put a pci card with sata 3 and if it worth the shot, but 160 is okay for me :)
     

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