Capacity: 256GB / 512GB Form Factor: M.2 2280 NAND Flash 3D TLC Dimensions (L x W x H): 80 x 22 x 6.1mm / 3.15 x 0.87 x 0.24inch Weight: 11g / 0.38oz Interface: PCIe Gen3x4 Performance (Max): Read 3500MB/s , Write 3000MB/s Maximum 4K random read/write IOPS: up to 390K/380K