M.2 NVMe SSD 256GB GOODRAM PX500 , Interface: PCIe3.0 x4 / NVMe1.3, M2 Type 2280 form factor, Sequential Reads/Writes 1850 MB/s/ 950 MB/s, Random (4k QD64) Read/Write 102K IOPS/ 230K IOPS, SMI 2263XT, 3D NAND TLC