4 TB Samsung 990 PRO M. 2 PCIe NVMe SSD. PCI Express 4.0 x4 (NVMe 2.0). Sequential Read/ Write: Up to 7450 MB/s / Up to 6900 MB/s. Our Samsung 990 PRO Gen4 SSD helps you reach near max performance with lightning-fast speeds. Whether youre a hardcore gamer or a tech guru, you get power efficiency built for the final boss. Interface : PCI Express 4.0 x4 (NVMe). Max Sequential Read: Up to 7450 MBps. Max Sequential Write: Up to 6900 MBps. 4KB Random Read: Random read (QD32) [IOPS]: up to 1,600,000 IOPS. 4KB Random Write: Random Write (QD32) [IOPS]: up to 1,550,000 IOPS. MTBF : 1,500,000 hours.