Update: The A03 to A05 BIOSes work with the SM951, but it seems like the SSD is stuck at x2 link width over PCIe 2.0. This means you'll only get about 750-800MB/s, when the chipset and port is physically capable of x4 (1500-1600MB/s), so a response from a Dell representative would be very helpful.
In my experience, most support agents don't know what they're talking about. It seems even less likely that someone that does know what they're talking about is going to help here, but we can hope.
I hate to high jack your post, but may I ask how your battery is holding out on the 9343? What's your battery life like?
I’d advise that you load defaults in the BIOS. Please follow the steps mentioned below to load the BIOS to defaults.
Also, I would suggest that you run the diagnostics on the computer by following the steps mentioned in the video below and check if there is any issue with the hardware on your system.
Please let me know the findings.
I tried the diagnostics and it was unable to detect the SM951 at all. The laptop could detect the drive while booting from a Windows installer USB, but there's no point in installing Windows to the drive if the BIOS won't recognize it afterwards for booting.
I would like to add that the XP941 (the previous generation PCIe AHCI M.2 SSD from Samsung) does work with the XPS 13 (2015) 9343 BIOS, so it should definitely be possible to fix this in a BIOS update, as the AHCI SM951 uses the same interface (there is also an NVMe SM951 but that isn't out yet nor would I expect it to work with any laptop).
Hi, the PCBs for the sm951(m.2) and PM851(mSATA) are different. What socket in the XPS13 are you able to insert the SM951 into?
I do also have the Alienware 13, with a Samsung SSD PM851 m.2 (512GB), but it works correctly.
I would like to buy another one, to extend the volume. Do you know a shop where I may find it or if I may order it directly from Dell?
Thanks for your help.
You got the XP941 to boot from the XPS 13? I tried to install it, and it exhibited the same behavior as your SM951 -- it was viewable from the Windows installation media, but not bootable.