If you have BIOS version 2.0 or higher, there will be a menu in the bios that you need to change to boot from PCI NVME.
For M.2 drives without OPROM, you will need to change the NVMe firmware source to ‘AMI Native Support’.
To change: Go to the ‘Advanced’/‘NVMe Firmware Source’ section
and select ‘AMI Native Support’.
If you are using the Intel AIC P4800X, which has an EFI OPROM by default, you will also need to change the slot OPROM to EFI, and the M.2 OPROM to EFI.
If you have an M.2 with Intel AIC P4800/P4600 or similar type of NVMe AIC installed:
1. Change the slot # x in which the card is installed from OPROM to EFI.
2. change the M.2 OPROM to EFI.
3. Go to BIOS setup menu >> Advanced >> PCI/PCIe/PnP Configuration>> NVMe Firmware Source >> AMI Native Support
Translated with DeepL.com (free version)
