Crucial P3 4TB PCIe Gen3 3D NAND NVMe M. 2 SSD, up to 3500MB/s – CT4000P3SSD8. NVMe (PCIe Gen3 x4) technology with up to 3500MB/s sequential reads, random read/write 650K/700K IOPS. Spacious storage up to 4TB. Performs up to 33% better than the previous generation. Rated at MTTF greater than 1.5 million hours for extended longevity and reliability.