iMac Mid 2011 SATA Speed limited to 3 Gigabit

Discussion in 'iMac' started by Nesha, Jan 26, 2013.

  1. Nesha macrumors newbie

    Joined:
    Jan 26, 2013
    #1
    Recently i have installed SSD from OWC - Mercury Electra 6G SSD

    I was expecting speeds about 500 MB/s
    but here is what i got instead:
    [​IMG]

    Here is what i have in system info:
    [​IMG]

    All is declared to 6 Gigabit but somehow i still heve 3 Gigabit speed.

    I saw on some links that i should upgrade firmware with this:
    Code:
    http://support.apple.com/kb/DL1380?viewlocale=en_US&locale=en_US
    but when i try to run this firmware i receive msg: "This software is not supported on your system."

    Please advice me is there any fix that i can apply to get 6 Gigabit instead of 3 ?
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    You can use the following applications to benchmark the speed of your SSD, to see, if BMST is reporting correctly.
     
  3. Nesha thread starter macrumors newbie

    Joined:
    Jan 26, 2013
    #3
    Here is Xbench output
    [​IMG]

    For some reason i am not able to test using AJA System Test, it does not let me to select my SSD (only my old HDD), also video card is not listed :
    [​IMG]


    Also here is what i found about my iMac model:
    *As shipped, these models only supported the 3 Gb/s Serial ATA 2.0 standard for both a 3.5" hard drive and a 2.5" SSD. However, as first discovered by site sponsor OWC, the iMac EFI Update 1.6, released two days later, quietly provided 6 Gb/s Serial ATA 3.0 support.

    source:
    Code:
    http://www.everymac.com/systems/apple/imac/specs/imac-core-i5-3.1-27-inch-aluminum-mid-2011-thunderbolt-specs.html
     
  4. Nesha thread starter macrumors newbie

    Joined:
    Jan 26, 2013
    #4
    I got great support from OWC and here is my result with QuickBench software. I guess it was only problem how i measured speed
    [​IMG]

    I have great speed up in boot time from 1 min and 18 sec to only 25 sec, so i guess that's it :)

    Regards
     

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