Then get an ASRock board that suppers the PCIe 3.0 x4 M.2 Type3
My PCIe 3.0 x8 RAID controller with SSDs in RAID0 is still faster, and will still be faster.
Fortunately, I can still have both of my single slot, water-cooled GPUs connected in PCIe 3.0 x16, as well as my PCIe 3.0 x8 LSI 9310-8i...