SSD Problems Yosamite

Discussion in 'iMac' started by Unknown96, Jun 19, 2015.

  1. Unknown96 macrumors newbie

    Unknown96

    Joined:
    Mar 30, 2015
    #1
    Hey guys today i changed to SSD On my iMac with a 240gb kingston, i puted it in a usb 3.0 enclosure and clean installed Yosemite 10.10, when i booted it was faster then on HDD, and apps performance was great except the read and write in benchmarks got me worried, i tried using trim enabler to enable trim same thing nothing changed. So any ideas how to get my read write faster? On hdd it was 110mb/s read and write 118mb/s on SSD it dropped to 40mb/s read and write. Any suggestions would be nice. Thank you :)
     
  2. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #2
    You bought a Kingston, such results are normal. Kingston makes cheap SSDs that use cheap NAND which perform poorly.

    http://www.anandtech.com/show/7763/an-update-to-kingston-ssdnow-v300-a-switch-to-slower-micron-nand
     
  3. Unknown96 thread starter macrumors newbie

    Unknown96

    Joined:
    Mar 30, 2015
    #3
    i got the SSD in my laptop and working pretty fast, what can i do to speed things up on my iMac?
     
  4. throAU macrumors 601

    throAU

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    Feb 13, 2012
    Location:
    Perth, Western Australia
    #4
    If your SSD is still connected via USB, then the 40 megabyte/sec read/write speeds are due to the limitations of the USB 2 bus.
     
  5. Unknown96 thread starter macrumors newbie

    Unknown96

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    Mar 30, 2015
  6. joe-h2o macrumors 6502a

    Joined:
    Jun 24, 2012
    #6
    You can't enable TRIM on the USB3 bus - it's for internal (or thunderbolt) busses only.

    My suggestion would be that your system is bottlenecked - likely because the USB bus is not designed for continuous high bandwidth data transfer when the system is under load.
     
  7. yjchua95 macrumors 604

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    #7
    The problem is, do BOTH the USB port and the USB enclosure support USB 3.0?
     
  8. Unknown96 thread starter macrumors newbie

    Unknown96

    Joined:
    Mar 30, 2015
    #8
    yes my ports supports 3.0 USB and in my country they don't sell thunderbolt enclosures or i would have bought one, do you guys know any cheap thunderbolt enclosures that i can see and buy ?
     
  9. yjchua95 macrumors 604

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    Apr 23, 2011
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    GVA, KUL, MEL (current), ZQN
    #9
    When it comes to Thunderbolt, there is no such thing as cheap.
     
  10. Unknown96 thread starter macrumors newbie

    Unknown96

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    Mar 30, 2015
  11. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #11
    You're not gonna get anywhere with Thunderbolt on that budget
     
  12. Unknown96 thread starter macrumors newbie

    Unknown96

    Joined:
    Mar 30, 2015
    #12
    That's okey i will order one from Australia Thanks anyways :) i will make it as solved this thread
     

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