Thinking about it now, I don't think my comment was correct.
According to the X570 block diagrams floating around, the chipset can have two M.2 drives attached with 4 lanes each in addition to the single M.2 hooked into the CPU. So right there I'm not sure if you could RAID all 3 drives, likely just the 2 on the PCH. But doesn't that also mean the PCH-CPU connection is only half the bandwidth of M.2 RAID0 (assuming both M.2 drives are PCIe 4 and max out their 4 lanes)?.
Im not too sure on that, but Intel run the nvme drives through the PCH and get full speed out of them ???? non of those are connected direct to the CPU.
ASUS also managed it with the CH7 AMD motherboard with 1 m.2 connected to the CPU and 1 connected to the PCH.
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