Mac Mini 5.1 (late 2011) With 2 SSD, 1 slower then other

Discussion in 'Mac mini' started by Restart, Jun 27, 2013.

  1. Restart Guest

    Hello People!
    Registered here because i hope to find a helpfull answer.
    I recently updated my mac mini late 2011 with 2 SSD drive's.
    A 64gb Sandisk and an OWC 120gb 6g.

    I use the OWC for system and apps and the 64gb for files.

    The read en write speed (in blackmagic) are significant lower on the OWC drive.
    System 2,3 intel core i5 and 8gb ram with 10.8.4 installed.

    Any idea why? Tried it both with trim support on and off, OWC advices not to enable trim, so its currently off. Thanx for helping out!

    Attached Files:

  2. hfg macrumors 68040


    Dec 1, 2006
    Cedar Rapids, IA. USA
    There are several threads regarding this here ...

    Testing SSDs which use Sandforce controllers (such as your OWC) using BlackMagic DiskSpeedTest will show poor results due to the data stream used for testing (non compressible data), however the SSD will perform well for most OS tasks. You will probably not notice the difference in day-to-day use between the two drives.

    Different test programs (AJA) may produce closer results, again due to the test algorithms.
  3. Omnius macrumors 6502a

    Jul 23, 2012
    It's also well documented that smaller SSDs perform worse than large SSDs in benchmarks such as this.
  4. geeji macrumors newbie

    Jul 24, 2012
    Except that here it is the larger SSD which is the slower...
  5. Omnius macrumors 6502a

    Jul 23, 2012
    Ah, I didn't read the post all the way through because these crops up so often.

    But all the same, it's not an apples to apples comparison. Possibly different controllers, one might be super full....
  6. opinio macrumors 65816

    Mar 23, 2013
    Your running your OS on the OWC drive which I am guessing is the drive on the right in black magic. Depending on what is running in OS at the time, and also OSX its self, will slow the read/write speeds. In other words the OWC SSD is doing two jobs when you run the test, OSX and the Black Magic test.
  7. Mighty Anderson macrumors newbie

    Nov 1, 2012
    First of all, I do not get convinced only by a benchmark test, because to me most of them are tweaked and hard coded at times! shocking? may be, but true. Guys, things are getting more commercial & we techies need to be cautious not to fall into these traps. I am not saying all of these are crap, but some of them are for sure. So, I would always ask my friends to perform real tests on the SSDs whichever they get, especially if they are sandforce based as real tests on these gives amazing results.
  8. Restart Guest

    Oright! Thanks for the support.
    Tested with different programs (xbench) and also 4gig make file in the terminal. Speeds are closer together, but the smaller sandisk wins every test.
    If this is due the fact that osx is intstalled on the OWC drive, so be it.

    however the SSD will perform well for most OS tasks. You will probably not notice the difference in day-to-day use between the two drives. True!

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