I have a Precision 5820 System that for about a year has worked fine. I added to it a "ASUS Hyper M.2 X16 PCIe 4.0 X4 Expansion Card Supports 4 NVMe" card with 3 NVME's Made my first NVME so it was bootable with my Windows 10 configuration. I has worked great with all my SSDs and all 3 of my NVME's for about a year. About a month ago the NVME drives stopped working and it reverted back to the original SSD from factory to boot as it was still original. I found that moving the Asus Card from slot 5 to slot 4 that the NVME's would show up again. Dell Support determined it must be slot 5 has issue so they sent out a tech to replace the motherboard. Now have a new motherboard in the server and now only 1 NVME will show up. I even got another PCIE/ NVME adapter card and put one of NVME's in but still only shows the initial NVME drive. I have tried to downgrade the bios and it will do the main bios but always fails when doing the "ME Firmwra EndUpdate " part. I have played with a variety of BIOS settings to even get the 1 NVME to show up and boot via UEFI boot. Not sure what to do but suspect it is a BIOS setting somewhere to all the rest of NVME's to show up. Advice would be appreciated as been playing with this for two days since motherboard replacement.
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to me sounds like a faulty replacement part (the fact that the slot is not showing all the nvme, and the fact that the bios flashing doesn't work as it should), so I would discuss about having it exchanged again
----------------------------------------------------- Happy owner of a dual silver T7820
A little more clarification can help to see how your system was setup and narrow down the issue better. So you have been running your system with 2 bootable drives the whole times. Was the original is NVMe in the flexbay?
Which slot do you consider slot 5? The official slot 5 is wired as x4, so it would only see 1 NVMe drive. Here is the description of the slots order: