The M.2 slot on XPS 8900 is a 2280 m key slot and supports NVMe & PCIe x1 only. I just added a WD BLACK PCIe Gen3 x4 NVMe SSD (512GB) on my XPS 8900 which I bought 2 years ago recently.
Also, you need to download the latest Win10 build which has NVMe driver bundled. Bootable media of older Windows 10 builds will not able to detect the NVMe SSD during installation unless you use a 3rd party NVMe driver.
You may download the Window Media Creation Tool to create a Windows 10 bootable USB flash drive that supports UEFI Secure Boot enabled.
546insp
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Posted July 31st, 2018 15:00
I couldn't get a NVME to work with my newer XPS 8920 so good luck with that.