Samsung 990 PRO 4TB:

• Sequential read: up to 7,450 MB/s
• Sequential write: up to 6,900 MB/s
• Random read: up to 1,600K IOPS
• Random write: up to 1,550K IOPS
• Cache: 4GB
• Cache Type: LPDDR4 DRAM
• NAND: Samsung V-NAND TLC
• Controller: Samsung in-house controller