Samsung 990 EVO Plus 4TB NVMe M.2 Internal Solid State Drive - PCI Express 4.0 x4, 5.0 x2 - NVMe 2.0 - M.2 2280 - V-NAND TLC - Up to 7250 MB/s Read Speed - Up to 6300 MB/s Write Speed (MZ-V9S4T0B/AM)