Runs great on Unraid 6.9.2 on my ASRock B550M Pro4 board in x1 slot. I haven't noticed any slowdown when reading/writing arrays or rebuilding parity. I only have 1 4TB drive attached but plan to add more in the future. Judging by the numbers, if your x1 slot is actually PCIe 3.0, you shouldn't see any slowdown when connecting 4 magnetic drives. There is also a blue flashing LED on the board in case you are interested in the case backlight. It's not me because you know I have a life.
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