MP 1,1-5,1 WD_BLACK SN750 NVMe Speeds

Discussion in 'Mac Pro' started by Manzana, Jul 31, 2019.

  1. Manzana macrumors 6502a

    Manzana

    Joined:
    Jul 19, 2004
    Location:
    Orange County, CA
    #1
    Installed on Mac Pro 5,1 with Mojave 10.14.6
    QNINE PCIe card
    on slot 4. using it to boot.
    read/write speeds using black disk magic are around 1,500

    seems people are getting about double this so is it my PCIe adaptor?

    by the way, not a gripe...it's fast enough. just interested in how this works.
     
  2. jbarley, Jul 31, 2019
    Last edited: Jul 31, 2019

    jbarley macrumors 68040

    jbarley

    Joined:
    Jul 1, 2006
    Location:
    Vancouver Island
    #2
  3. Manzana thread starter macrumors 6502a

    Manzana

    Joined:
    Jul 19, 2004
    Location:
    Orange County, CA
    #3
    ok good to know. I would need to upgrade to a pricier adapter and it seems I would have to use slot 1/2 as well, which are both occupied on my system by a RX 590.
    So I will be quite happy with 1,500 read/write speeds as it is about 5x faster than the SATA SSD I had.
     
  4. crjackson2134, Aug 1, 2019
    Last edited: Aug 1, 2019

    crjackson2134 macrumors 601

    crjackson2134

    Joined:
    Mar 6, 2013
    Location:
    Charlotte, NC
    #4
    It’s not really an adapter issue. It's the maximum limit of your PCIe Slot in standard use. However, there are carrier boards that have a switch on them that can multiplex the data across all 16 lanes of a single Slot. This increases the total data throughput of the device it carries (SSD's usually).

    You can put your GPU in Slot 2, and this will open up Slot 1 for use by one of these high end carriers. It will however block Slot 3 since the GPU requires 2 Slots (+). Slot 4 will still be available for MOST other uses.

    This is exactly the setup I have I use at the moment. PCIe Slot 4 in my system contains a USB 3.0 card.
     
  5. Manzana thread starter macrumors 6502a

    Manzana

    Joined:
    Jul 19, 2004
    Location:
    Orange County, CA
    #5
    Ok this is so simple and yet so genius! If down the line we ever get the ability to boot raid 0 i will most definitely go with one of these adapters and 2-4 blades.

    I pretty much only need the 3 slots. Video card, NVMe and USB.
     
  6. Manzana thread starter macrumors 6502a

    Manzana

    Joined:
    Jul 19, 2004
    Location:
    Orange County, CA
    #6
    Oh man, totally forgot my video card takes up more than 2 slots, enough so that when I put it in PCIe slot 2 it partially covers slot 4...bummer!

    I can still return RX 590 to micro center, problem is I really like it! Decisions decisions.
     

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5 July 31, 2019