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eligrey
1 Copper

XPS 13 (2015) 9343 BIOS limiting SM951 SSD to x2 link width

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.

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74 Replies
KLCDredd
1 Copper

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

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?

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Moderator
Moderator

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

Hi eligrey,

I’d advise that you load defaults in the BIOS. Please follow the steps mentioned below to load the BIOS to defaults.

  1. Reboot the computer.
  2. When prompted during POST, press the <F2> key to enter the setup screen.
  3. On the System Setup screen, press the <F9> key.
  4. Press the <Enter> key on Yes to Load Optimized Defaults and restart the computer.

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.

http://dell.to/164l6g4

Please let me know the findings.

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eligrey
1 Copper

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

Hey Ravi,

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).

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RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

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?

Thanks.

Regards, Chris. 

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eligrey
1 Copper

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

The PM851 in this laptop comes in a M.2 form factor (M+B key), and it is inserted in an M key M.2 socket.

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

Thanks, that explains why the XP941 works.  

Regards, Chris.

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ericfavre
1 Copper

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

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.

Eric

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eligrey
1 Copper

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

I am willing to mail my SM951 in to Dell if it will help engineers test a BIOS update, as long as it is returned afterwards.

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edwardhchan
1 Copper

RE: BIOS on XPS 13 (2015) 9343 not recognizing SM951 SSD

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.

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