Why so extreme price differences between M2 adaptors

Discussion in 'Mac Pro' started by Tharayman, Jun 5, 2019.

  1. Tharayman macrumors newbie

    Joined:
    Feb 4, 2018
    #1
    I was looking into getting a PCI-E M2 adaptor for my 3,1 and was browsing several models. what puzzles me is the huge price differences between adaptor. From Highpoint`s 600$ extreme to a 300$ QNAP QM2-2P10G1T, and all the way down to 30$ for a two space adaptor from Startech. Is this a case of higher price - higher performance ? Or are the known brands just overcharging? Intuitively I would belive performance was mainly due to the drives you put in the adaptor, not the controller card itself...
     
  2. tsialex macrumors 601

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #2
    Cheap adaptors are just passive adaptors to convert the M.2 connector to the PCIe slot.

    Switched cards use PCIe switches to connect 2/4/6 M.2 blades to a 8x or 16x PCIe slot. PCIe switches cost over $120 just for the switch itself.
     
  3. Tharayman thread starter macrumors newbie

    Joined:
    Feb 4, 2018
    #3
    I see!
    Any particular you guys recommend then?
     
  4. tsialex macrumors 601

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #4
    Take a look on the first post of the Blade SSDs - NVMe & AHCI thread. A good cheap choice is AquaComputer kryoM.2 EVO.
     
  5. Tharayman thread starter macrumors newbie

    Joined:
    Feb 4, 2018
    #5
    It is important to have cooling for M2 SSD`s?
     
  6. tsialex macrumors 601

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #6
    970PRO 5 minutes after power up, doing Spotlight indexing, gets to 74ºC. If you don't want to live with thermal throttle, or worse, overheat - use a heatsink.
     
  7. fatespawn macrumors regular

    fatespawn

    Joined:
    Feb 22, 2009
    Location:
    Chicagoish
    #7
    Others will have more technical answers, but I can tell you what my 970Pro is reporting. I cloned my old boot drive to it originally (300GB continuous write?) and I do weekly clone backups (80GB's at a time?) Total power on time for my drive is 1 month 17 days. My lifetime maximum temperature ever reached was 50c which is far below the recommended maximum limit of 81c.

    That's with the AquaComputer kryoM.2 heatsink.
    --- Post Merged, Jun 10, 2019 ---

    Really? Wow. Is that with a heatsink?
     
  8. tsialex macrumors 601

    tsialex

    Joined:
    Jun 13, 2016
    Location:
    Brazil
    #8
    Without a heatsink. I was doing some tests with an SM951-AHCI 4-blade array with my SSD7101-A and used a Chinese no-name adapter with my 970 Pro, within 5 minutes from power up DriveDX warned about overheat.
     

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7 June 5, 2019