SSD7103 - Bootable, 4x dedicated M.2 Ports to PCIe 3.0 x16 NVMe RAID Controller The Ultimate NVMe Booting Solution
Made a fusion drive on a 2012 MacPro 5,1 with two Samsung 970 Pro SSDs on a HighPoint SSD7102 NVMe RAID controller card. Pretty speedy. : r/macsysadmin