Samsung 990 PRO 4 TB NVMe SSD W/Heatsink – Read Speed up to 7450 MB/s, Write Speed to up 6900 MB/s, Random Read up to 1400000 IOPS, Random Write up to 1550000 IOPS, PCIe 4.0 x4, NVMe 2.0, V-Nand 3bit MLC; In-house Controller, 2GB Low Power DDR4, 2400TBW 5 Years Carry-in Warranty or 2400TBW Features: Gen4 with 55%+ improvement in random performance compared to 980 PRO. Read & write speeds up to 7450/6900 MB/s². Reach near max performance of PCIe 4.0³ powering through for any use.