My boot drive is a Samsung 860 Pro 512 GB. I have a 2 TB hard drive that I tried to replace with a second NVMe PCIe drive--an Intel 660p 2 TB drive. I used a Vantec M.2 NVMe SSD PCIe x 4 adapter
Anyway, I mounted the SSD on the card and installed it into the PCI-Express x4 card slot (SLOT 4).. The system showed a Dell logo and would not boot. I removed the card and the system worked.
I looked in the messages here and did not find any specific mention of trying this. I assume a SATA SSD would work fine and I planned to install one but the 2 TB Intel SSD at $194 was less expensive than SATA cards.
Does anyone know if the XPS 8910 can support two NVMe PCIe cards?