I think the problem is the work of nvme, it’s exactly in the pci express lines.
EVGA Classified SR-2 works with pci express like this: The seven PCI Express x16 slots can work in two ways: “x16+x16+x16+x16” or “x16+x8+x8+x8+x8+x8+x8”.
That’s why nvme doesn’t work.
If possible, this can be checked.
You need to put a video card in the first slot, and put such an adapter in the next x16 slot
put four NVME into it (the first is samsung 950 pro, the other three do not matter). Thus, the second slot will be x16 and the computer will see your samsung and install the system on it.
But only 1 NVME will work, because there are no settings in the BIOS for dividing x16 by x4+x4+x4+x4.
The ideal solution is a BIOS mod for dividing PCI Express lines into x4+x4+x4+x4.