Different class 40 SSD drives

I was thinking that might be the case. However, they do have different part numbers.

I don't think Dell offers two different 256 GB PCle M.2 SSDs for the XPS 8920. I think they are the same drive, they just left off the NVMe part.

I went the the Dell outlet site and all the XPS 8920s with the 256 GB SSD say NVMe now. I couldn't find any part numbers for the drive.

Thanks for your help. I only found part numbers by adding the computer to my cart and in the checkout page clicking on detail view. I Googled the part number and found some hits, but nothing that described the drive.

I see two different part numbers and one of them explicitly states NVMe. My concern is whether the other part (that does not indicate NVMe) is actually running on the SATA bus and only providing HDD type speeds.

Sorry I could be not be more help.

I see two different part numbers and one of them explicitly states NVMe. My concern is whether the other part (that does not indicate NVMe) is actually running on the SATA bus and only providing HDD type speeds.

Can you post the part numbers?

No. You actually pointed me in the right direction. Thank you very much!!!

256GB PCIe M.2 NVMe Class 40 Solid State Drive    FX0X4

256GB PCIe M.2 Class 40 Solid State Drive    31WXW

here is a post that might help.

http://en.community.dell.com/support-forums/laptop/f/3518/t/19992358?pi41097=4

image from that posting

There is no difference.  Class 40 is PCI-E aka NVME.

Higher the class Higher Price.

Class 10 is SATA 2.5 inch  30K

Class 20 is SATA 2.5 inch  80K

Class 30 is SATA 2.5 inch  90K

Class 40 is PCI-E SSD      200K

Class 50 is PCI-E SSD      300K