The Lenovo ThinkPad P1 Gen 4 Laptop Supports Single or Dual Drive Configurations Depending on the Graphics Card Installed. (One M.2 NGFF (2280) Drive Slot with the NVIDIA GeForce RTX 3070/3080 Graphics Card or NVIDIA RTX A3000/A4000/A5000 Graphics Card) or (Two M.2 NGFF (2280) Drive Slots with the Intel UHD Graphics, NVIDIA T1200 or NVIDIA RTX A2000 Graphics Card) Note: M.2 slot 1 (slot A NVMe0) supports Generation 4.0 x4 and 3.0 x4 speeds and M.2 slot 2 (slot B NVMe1) supports Generation 3.0 x4 speeds. The M.2 Drive with PCI NVMe Generation 4.0 x4 performance is downgraded closer to PCIe NVMe Generation 3.0 x4 performance in M.2 slot 2 (slot B NVMe1).