DESCRIPTION :
Product Type: Internal Solid State Drive (SSD)
Brand: Samsung
Model: 990 PRO (Gen4)
Capacity: 4 TB
Form Factor: M.2 2280
Interface: PCIe 4.0 ×4 (NVMe 2.0) 
Performance
Sequential Read Speed: Up to 7,450 MB/s
Sequential Write Speed: Up to 6,900 MB/s 
Random Read (4 KB, QD32): Up to 1,600,000 IOPS
Random Write (4 KB, QD32): Up to 1,550,000 IOPS
Technology & Features
NAND Type: Samsung V‑NAND TLC
Controller: Samsung in-house
Cache Memory: 4 GB Low‑Power DDR4 SDRAM 
Thermal Design:
Nickel-coated controller
Heat spreader label
Dynamic Thermal Guard for consistent performance 
Power Efficiency: Over 50% better performance per watt compared to 980 Pro 
Software Support: Samsung Magician for firmware updates, drive health monitoring, performance tuning, benchmarking, encryption setup 
Durability & Reliability
Endurance (TBW): 2,400 TBW (Total Bytes Written) 
Warranty: 5-year limited or until 2,400 TBW—whichever comes first 
MTBF (Mean Time Between Failures): 1.5 million hours 
Physical & Environmental Specs
Dimensions: 80 × 22 × 2.3 mm
Weight: Up to 9 g 
Power Consumption:
Average: ~6.5 W
Burst Peak: up to ~8.6 W
Idle: up to 55 mW 
Temperature Range: 0 °C to 70 °C
Shock Tolerance: 1,500 G / 0.5 ms 
Security & Other Features:
Supports TRIM, S.M.A.R.T., and Garbage Collection
AES 256-bit encryption, TCG/Opal, IEEE1667
Device Sleep Mode support