I have a 3460 SFF that I added 2 additional nVME SSD drives to the open m2 2280 slots.  One of the drives is new WD 850x.  All the reviews/testing of this drive show that is should easily hit 6-7K MB/s but I'm seeing around 1800 MB/s.  in CrystalDiskMark. 

I contacted Dell support but because the drive was not purchased from them, they are unwilling to help/support.

I'm running Windows 11 Professional with all the latest drivers, BIOS, etc.

Any thoughts/ideas on why I'd be seeing decreased performance?

Thanks for the help!