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Not quite I understand the last part of your post.
My question is will it work if installed using a PCIe adapter card similar to say my Kington HyperX predator?.
Maybe a card such as this?
https://www.amazon.com/Lycom-DT-120-PCIe-Adapter-Support/dp/B00MYCQP38

M2 format has 3 types of cards.

  1. SATA = it's just a SATA disk in a different format. Same characteristics as a SATA drive, can be converted to the same format as SATA 2.5" drives using adaptors.
  2. PCIe AHCI = it's a real PCIe SSD that uses PCIe 2x or 4x with AHCI protocol. The simplest one to use in a MP.
  3. PCIe NVMe = it's a real PCIe SSD that uses PCIe 2x or 4x with NVMe protocol.
Any M2 SATA SSD will need an adaptor and a cable, usually you buy a card that gets power from the PCIe slot and has a connector to plug a SATA cable to the SATA ODD ports on the backplane. It's a bad choice for a Mac Pro since you will loose one PCIe slot and one ODD drive bay to use a slow drive.
 
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jbarley

tsialex is 100% correct but this post #207 https://forums.macrumors.com/thread...-0-ssd-performance-for-the-cmp.2124253/page-9 might also help you undertstand the differences in M.2 blade.

There are quite a few "2 BLADE " M.2 adapters out there that support either ONE ( now bootable in High Sierra ) NVMe or AHCI blade. . . .or // / ONE SATA M.2 SSD blade .. = they require a SATA cable to your cMP's SATA DATA PORT.

Look at the socket connectors in the above post.

You'll soon understand.
 
M2 format has 3 types of cards.

  1. SATA = it's just a SATA disk in a different format. Same characteristics as a SATA drive, can be converted to the same format as SATA 2.5" drives using adaptors.
  2. PCIe AHCI = it's a real PCIe SSD that uses PCIe 2x or 4x with AHCI protocol. The simplest one to use in a MP.
  3. PCIe NVMe = it's a real PCIe SSD that uses PCIe 2x or 4x with NVMe protocol.
Any M2 SATA SSD will need a adaptor and a cable, usually you buy a card that gets power from the PCIe slot and has a connector to plug a SATA cable to the SATA ODD ports on the backplane. It's a bad choice for a Mac Pro since you will loose one PCIe slot and one ODD drive bay to use a slow drive.
Thank you for the explanation, now this explains the low price which I sorta felt might be too good to be true.:(
 
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