Why can my iMac 5k Late 2015 only achieve 700Mb/s read speed?

Discussion in 'iMac' started by macpokerstars, Apr 2, 2017.

  1. macpokerstars macrumors member

    Sep 29, 2010
    I have the iMac 5k i5 3.2Ghz Late 2015 and I installed a 256GB PCIe SSD (MZ-JPU256T/0A6).

    I can only achieve 700Mb/s read speed instead of 1300, where as my Macbook Pro early 2015 can do 1300Mb/s with its 512GB ssd.

    Is it because the model I bought for the iMac is an older SSD? Or is it because of the capacity?

    What would happen if I put my Macbook Pro's 512 SSD in my iMac?

  2. Gav2k macrumors G3


    Jul 24, 2009

  3. keysofanxiety macrumors G3


    Nov 23, 2011
    The SSD you installed was from a 2013 rMBP. That's why the speeds are much slower.

    Conversely if you installed your 2015 one, you'd see the same speeds you currently are on your rMBP.

    TL;DR: speeds are due to the age/model of the SSD.

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