MP 1,1-5,1 Mac Pro 3,1 and M.2 SSD

Discussion in 'Mac Pro' started by alexffff, Jul 18, 2019.

  1. alexffff macrumors newbie

    Joined:
    Aug 26, 2017
    #1
    Hello, everybody!

    I have a question.

    If I put Samsung 970 Evo with PCI-E 3.0 x4 to M.2 adapter in PCI-E x16 slot, will it work on its maximum speed?
     
  2. tsialex macrumors 603

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #2
    No, 970 Pro is a 4x device, installing it on a PCIe 2.0 x16 don't change this fact.

    To get any M2 drive past ~1400MB/s when installed in a MP3,1/4,1/5,1 you need an adapter with a PCIe 3.0 switch like Highpoint SSD7101-A or Amfeltec Squid 3.0 to convert PCIe 2.0 x16 into PCIe 3.0 x4.Not even the IOCrest card can get the full speed of a Samsung 970 since it's a 8x card, but it's near.

    BTW, don't forget that MP3,1 don't support NVMe, APFS nor configures the PCIe slots for 5GT/s automatically. You will have to hack the BootROM for NVMe and APFS support and configure the slots at every boot to 5GT/s. I would try to find a cheap MP4,1…
     
  3. alexffff thread starter macrumors newbie

    Joined:
    Aug 26, 2017
    #3
    Cheap MP4,1.. How much should be cheap?)

    And what is abou HFS+? Will NVMe SSD with HFS+ work with patched BootRom?
     
  4. tsialex macrumors 603

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #4
    I don't know where you are, but check locally since a lot of business/users are selling MP4,1/MP5,1 since the MP7,1 was announced.

    HFS will limit you to 10.13 and you still need to patch the BootROM for NVMe boot support. Don't forget that MP3,1 is the easiest Mac Pro to brick and the most difficult to repair, since the BootROM is split between a TSOP FWB flash memory and a SPI flash memory.
     
  5. alexffff thread starter macrumors newbie

    Joined:
    Aug 26, 2017
    #5
    what speed can i get using 970 evo with simple adapter without converting pcie 2 into pcie 3?
     
  6. tsialex macrumors 603

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #6
    I already told it on the post you quoted, a little over 1400MB/s - if pcietools were used to set the MP3,1 PCIe slot to PCIe 2.0 5GT/s, since the default for a MP3,1 is half of that, a little over 700MB/s.
     

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5 July 18, 2019