For the purpose of closure ,,,   After the AHCI change as advised by RoHe ... top tip! I have installed a Seagate FireCuda 530, 4 TB, Internal Solid State Drive - M.2 PCIe Gen4 ×4 NVMe on the spare M2 socket and a Samsung 870 QVO 8 TB SATA 2.5 Inch Internal Solid State Drive (SSD) (MZ-77Q8T0), Black on the Sata. I've hit both quite hard, and both are performing as expected with the capacities as expected. Very happy! Alan
I'm about to order a UK XPS 8950  i9-12900K processor + 1TB M.2 PCIe NVMe SSD boot . I believe one of the two M.2 2280 slots will be vacant. The XPS 8950 “Setup and Specifications” doc page 17 seems to imply that the maximum capacity for a SATA drive is 2TB (!) and an M.2 2280 SSD drive is also capped at 2TB.    Are both these statements correct?   Surely I must be reading it wrong somehow? I want to install a 4TB SSD on the SATA and a 4TB M2 SSD (Seagate FireCuda 530 M.2 PCIe Gen4 ×4 NVMe ) on the spare non boot M2 slot.  Can I do this to create an additional 2 * 4TB drives? Many thanks for any clarification. Alan
XPS 8950, M.2 and SATA max capacities - 2TB?