NVME discs will not boot on a machine without UEFI bios, the lone exemption being the Samsung Pro 950 (not the 951).
Just found this out the hard way when I tried to revive an old Nvidia 780A SLI mainboard with a Phenom X4 and all I had was a NVME-disk with a PCI-e card interface.
It can be found by the Win10 installer,…