@tiarna :
Yes, users with a Samsung 950 PRO SSD don’t need to put an NVMe module into the mainboard BIOS. They can boot off the NVMe SSD in LEGACY mode.
Maybe the Samsung 960 PRO has an NVMe Option ROM within its NVMe chip as well, but I don’t know it for sure.
@Vincent12 :
Your experience verifies, that AMI’s MMTool v4.50 is the best and safest choice for the insertion of the NVMe module.
Question: Why didn’t you simply follow my guide?
Regarding the BIOS of the Gigabyte Z77X-UD5H you are wrong: It only contains Option ROMs from Intel, Marvell and Atheros, but no NVMe Option ROM. I just have checked it.
By the way: NVMe SSDs like the Samsung 950 PRO, which supports booting off NVMe SSDs in LEGACY mode, have the required NVMe Option ROM within the SSD chip and never within the mainboard BIOS.
@all:
Due to Christmas I will not be online for some days. I will be back on 26th December.