So, today I got my Highpoint 7101A-1 and four Samsung 2TB EVO Plus NVMe drives. It's working fine in my Mac Pro 7,1 after I figured out one problem that held me up for a bit. All of the software loaded fine and the Mac even saw the drives, but the RAID manager software would not work, so I couldn't create a RAID set. To make it work, I had to disable Secure Boot by starting in Recovery Mode. After that, everything was fine. Made the RAID set, formatted, and then changed the icon because I don't like the dumb default icon Catalina gave it.
I didn't run any performance benchmarks, and right now I decided not to use it as a boot volume: I'm just going to use the built-in drive for booting and my apps, and I put my photo library on the NVMe RAID 0 set I created. One question though: Would Lightroom work faster if it was also installed/run off of the RAID set? I've never used a setup like this before so I'm in the dark about that.
Before anyone chimes in, the whole thing will be backed up to an external TB3 Promise array, so no worries on data loss.
Some observations: The fan is definitely annoyingly loud. I prepared for that and I have the replacement fan on the way from DigiKey. I'll swap it out when it arrives. It took the beautiful near silence of the Mac Pro and added an annoying mosquito-like whine. Looking at the heatsink setup it occurred to me that one could probably cut/file off the front end near the fan, remove the fan and let the wind tunnel arrangement of the Mac Pro do the cooling with no fan at all. I don't have a way to measure the temps of the blades if I did that, so not sure if that would be wise/safe? I'll see what the quieter fan is like before I try that. I also ordered some cheap copper heatsinks recommended in
post #242 in this thread; I might end up installing those as well. I feel that if the Mac Pro fans push enough air to cool that Xeon they should be able to easily cool those NVMe drives as well.
Overall I'm really happy with this, it was blazingly fast copying files internally. The expandability of the new Mac Pro was the prime reason I bought one; I had one of the original Intel Mac Pro 1,1 models and loved it, but when it got long in the tooth they had moved on the trashcan and I just couldn't bring myself to buy something so limited. I spent the last five+ years using just my MBP's and dealing with the shortcomings. It's nice to have an expandable/upgradeable Mac Pro again.