In my m7510 I have primary SSD installed on factory and that is PM951 NVMe. Perhaps due to specific of that drive SATA mode is set to RAID in the BIOS. Lated I have added extra SSD drive to the empty hdd bay, namely Sumsung 850 EVO. Samsung Magician software tells it operates in non-optimum conditions because of AHCI is not enabled. In other thread where I was asking about the way to switch to AHCI I was told to not do so. I have googled for NVMe benefits and it seems the suggestion was right, having NVMe one would not like to run it in AHCI.
However, the question open remains: is there any chance to make better operation condition (like AHCI) to the secondary drive, having primary one in its native mode?