Samsung XP941 256GB AHCI M.2 80mm PCIe 2.0 x4  SSD MZHPU256HCGL - OEM 512MB LPDDR2 DRAM Buffer Memory 3 Year Warranty, Support Standard AHCI driver, Support Toggle 2.0 interface, End-to-End Data Protection, Support TRIM Command, RoHS Compliant, Halogen-Free Compliance Works with most Z97 and X99 motherboards and Mac Pro models. Not compatible with the MacBook Air, Retina MacBook Pro or Cylindrical Mac Pro M.2 Interface: PCIe Gen2 5Gb/s, up to 4 lanes Sequential Read: 1080MB/s, Sequential Write: 800 MB/s, Random Read (QD=32): 120K IOPS, Random Write (QD=32): 60K IOPS