Inconsistent m.2 write speed

Discussion in 'Mac Pro' started by adam9c1, Dec 14, 2018.

  1. adam9c1 macrumors 68000

    adam9c1

    Joined:
    May 2, 2012
    Location:
    Chicagoland
    #1
    cMP 5,1
    3.2 hex core
    Lycom DT-120 adapter
    Samsung 970 EVO 256GB
    Blackmagic
    360 MB/s write
    1500 MB/s read


    any idea why?
     
  2. skizzo macrumors regular

    Joined:
    Apr 11, 2018
    #2
    have you tried enabling or disabling trim to see what that does?
     
  3. Zeke D macrumors 65816

    Zeke D

    Joined:
    Nov 18, 2011
    Location:
    Arizona
    #3
    I'm sure you've checked this, but is TRIM turned on? An apple update turned off TRIM for me, and I was getting that.
     
  4. MIKX macrumors 65816

    MIKX

    Joined:
    Dec 16, 2004
    Location:
    Japan
    #4
    Which PCIe slot is it in ? It should be in Slot 3 or 4
     
  5. h9826790 macrumors G5

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #5
    As long as he can get 1500MB/s read speed, slot or firmware version cannot be the root cause of slow write issue.
     
  6. adam9c1 thread starter macrumors 68000

    adam9c1

    Joined:
    May 2, 2012
    Location:
    Chicagoland

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5 December 14, 2018