Sorry, I was talking about the AHCI SM951 because it’s the only one available currently, but since I hadn’t purchased anything yet, the NVMe model was an option. Performance wise I don’t see a difference for normal desktop use.
I did order the AHCI version of SM951 and an ASUS Hyper M.2 PCI-E adapter card on Sunday. I should have both of them by Thursday or Friday.
My ASUS MAXIMUS V EXTREME does have Dual BIOS, so I should be able to switch BIOS if a modded BIOS has problems. Over at the ASUS ROG website someone with a Z87 board was successful at getting the SM951 (AHCI) with PCI-E adapter working (boot Windows). He stated that he added Ahci170, NVME, Samsung_m2_dxe, and SataDriver modules to his BIOS. The files came from Z97 equivalent board. I wonder if that would allow the NVMe model of SM951 to also operate as boot drive?
When the NVMe SM951 is available, and if the price is reasonable, I would try it out also. I can use both SM951s if my MSI Z77A-GD65 GAMING can utilize one of them. I don’t know how modifiable MSI BIOS is compared to ASUS.