The Dell Precision 15 3000 (3570) Mobile Workstation (DDR4) Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2230) Solid State Drives) Note: Both M.2 slots support M.2 (2230) Drives by installing the M.2 2230 solid state drive holder to accommodate the form factor. (M.2 slot 1 (SSD-1) supports PCIe NVMe Generation 4.0 x4 and 3.0 x4 Drives and M.2 slot 2 (SSD-2) supports PCIe NVMe Generation 3.0 x4 Drives)