Usually if the PATA_SS is still visible, means that your NOT booting in PURE UEFI environment (CSM OFF), you’re using CSM ON or AUTO, as is stated in Fernando’s guide (for most of mboards behaviour) on step #3, Additional Notes, read it.
I do recommend a clean OS installation in a PURE UEFI environment, with ONLY the NVMe disk attached to the system, later plug in any additional disks, for the best system performance, when ever possible (requires also a EFI GPU compatible device).