PCI-e SSD help required.

Discussion in 'Mac Pro' started by deerworrier, Mar 30, 2018.

  1. deerworrier macrumors newbie

    deerworrier

    Joined:
    Feb 18, 2018
    Location:
    New Zealand
    #1
    evening folks,
    i have pretty much finished my 4,1 upgrade.
    running high sierra on 5,1 firmware with twin 3.3 cpus
    64gb ram and 2x pci-e ssd card in slots 3 & 4.

    the last is giving me issues, the pics below should show it. i can only achieve 680 on the write speed?
    every other install i have seen give read and write around the 1300-1400 mark.

    i have enabled trim force so its not that, the 2 pci-e are not raid 0? don't know if this makes a difference.

    i know it is still pretty quick by what the old brick originally operated at but id like to squeeze everything i can out of it.
    any assistance appreciated.
    [​IMG]

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    im not very familiar with kext files (see clueless) so if its something like that a link to an idiots guide would be welcome:)
     
  2. deerworrier thread starter macrumors newbie

    deerworrier

    Joined:
    Feb 18, 2018
    Location:
    New Zealand
    #3
    bugger, that would help!

    2x Lycom DT120 PCIe
    2x SM951 blades

    cheers
     
  3. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    What capacity?
     
  4. deerworrier thread starter macrumors newbie

    deerworrier

    Joined:
    Feb 18, 2018
    Location:
    New Zealand
  5. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #6
    That's the correct write speed for 128GB SM951 AHCI.
     
  6. deerworrier thread starter macrumors newbie

    deerworrier

    Joined:
    Feb 18, 2018
    Location:
    New Zealand
    #7
    that would explain it then:) thanks for the info.
    if i were to raid0 the 2 blades am i right in thinking that would double the write speed?
     
  7. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #8
    Yes, for your case, the write speed should be around double, but more or less no improvement on the read speed, because slot 3 and 4 share use the same PCIe 2.0 x4 bandwidth.
     
  8. deerworrier thread starter macrumors newbie

    deerworrier

    Joined:
    Feb 18, 2018
    Location:
    New Zealand
    #9
    thank you mate.
    thats my project for tomorrow.
     

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