Installed SSD, but benchmarks are much lower than spec...

Discussion in 'MacBook Pro' started by catachip, Aug 25, 2010.

  1. catachip macrumors regular


    Jun 7, 2007
    Vancouver, British Columbia
    I have a brand new 15" MacBook Pro i7

    I just installed a new Corsair 120gb Force Series SSD.

    I booted off the OS X disk and used disk utility to restore my stock drive to the SSD. There is about 85 gb free.

    After a fresh restart I ran xbench and go these scores (see below).

    According to the specs, the peak should be 285 MB/s read, 275 MB/s write, but I'm not even breaking 200 on any of them. Am I doing something wrong, should I start over and install Snow Leopard fresh?

    It feels fast, but I want to make sure I'm getting what I paid for right out of the gate at least.

    Thanks so much!

    Results 313.95
    System Info
    Xbench Version 1.3
    System Version 10.6.4 (10F569)
    Physical RAM 4096 MB
    Model MacBookPro6,2
    Drive Type Corsair CSSD-F120GB2
    Disk Test 313.95
    Sequential 188.25
    Uncached Write 270.41 166.03 MB/sec [4K blocks]
    Uncached Write 266.17 150.60 MB/sec [256K blocks]
    Uncached Read 91.37 26.74 MB/sec [4K blocks]
    Uncached Read 350.95 176.39 MB/sec [256K blocks]
    Random 944.87
    Uncached Write 1266.32 134.05 MB/sec [4K blocks]
    Uncached Write 493.91 158.12 MB/sec [256K blocks]
    Uncached Read 2973.09 21.07 MB/sec [4K blocks]
    Uncached Read 923.63 171.39 MB/sec [256K blocks]
  2. farmermac macrumors 6502a

    Jul 23, 2009
    In the world of computers hardly anything performs up to advertised standards. That's probably under perfect lab conditions.
  3. Evo-L macrumors member

    Feb 28, 2008
    I do not know why the speeds are low, but like he said above, those speeds might be theoretical maximums...

    I would back up your entire HDD, maybe "clone" it, then reinstall a fresh snow leopard. Test it then, if there is a big difference then load your files onto it that way. If not, just restore from backup and enjoy the powah!
  4. Jaro65 macrumors 68040


    Mar 27, 2009
    Seattle, WA
    Your overall result is 300+. That's a pretty solid number as far as SSD's go.
  5. pandamonia macrumors 6502a

    Nov 15, 2009
    i benched my 240GB version of that drive yesterday.

    about 330 score i got.

    the issue might be that these are system drives which affect the speed. some speed tests are done on a empty drive with no OS running which can affect performance.

    Also Xbench is rubbish its not a very good HD test.

    i benched mine in windows 7 and got a crap score because bootcamp runs windows in IDE mode which kills your score.

    nightmare i know.

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