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Works great on a Mac Pro 5,1 with Firmware 126.96.36.199. I added two addlink S70 NVMe SSD, 1 x 1TB for bootdrive and the other 2TB for data. Speed is good for video editing. Screws and small screwdriver provided underneath the box for securing the SSD.
Reason for 4 star because the metal back piece that secure the card in a slot at the back of the card was bend deal to knocks during transportation. Should have better packaging.
I ran out of drive bays in my server, so I opted for this since I had a spare PCI-E slot.
I wish this could use NVMe drives, but SATA drives are easy enough to find. I installed it and 2 SSDs in my machine, and it was recognized in Debian Buster without any issues. No configuration needed, aside from initializing the drives, obviously.