Samsung 512GB M.2 PCI Express Gen3 x4,Solid state drive SSD,PM951 Model: PM951 / Interface: PCI Express Gen3 x4. Please make sure , your system supports PCIe NVME SSD. This drive could be mistaken for M.2 PCIe AHCI SSD, or M.2 SATA based SSD. Form Factor: M.2 / Capacity: 512GB Sequential Read: Up to 1050 MB/s / Sequential Write: Up to 560 MB/s Random Read: Up to 250K IOPS / Random Write: Up to 144K IOPS Not compatible to iMac, Macbook Pro or Macbook Air