Transcend PCIe SSD 220S 256GB M.2-2280 Internal Solid State Drive - PCI Express Gen3 x4, NVMe 1.3 - 3D NAND Flash - 8-channel Controller - DRAM Cache - Sequential Read up to 3,300 MB/s - Sequential Write up to 1,250 MB/s (TS256GMTE220S)