Samsung 990 PRO 4000GB

The Samsung 990 PRO 4000GB utilizes Samsung’s proprietary Pascal controller, manufactured on an 8nm process, paired with 4GB of LPDDR4 DRAM for mapping tables. Unlike lower capacities in this series that launched with 7th Generation V-NAND, the 4TB model typically leverages Samsung’s 8th Generation (V8) TLC NAND to achieve higher density on a single-sided PCB. This architecture allows the drive to nearly saturate the PCIe 4.0 bandwidth while maintaining a compact thermal footprint. The Pascal controller introduces hardware automation for data path management, reducing latency and improving random read/write IOPS compared to the preceding Elpis controller. The drive natively supports the NVMe 2.0 protocol, including features like Zoned Namespaces (ZNS). The transition to V8 NAND in the 4TB variant allows for increased die density (1Tb dies), reducing physical chip count and aiding thermal dissipation and power efficiency. Field notes: the 990 PRO series had a firmware bug in early 2023 that caused rapid health degradation reporting in S.M.A.R.T. data; the 4TB variant was released after the critical firmware patch (ISO 5B2QGXA7) was deployed, so integrators should verify the drive is running the latest firmware revision. Users report that the single-sided design makes the 4TB model highly compatible with ultra-thin laptops and the PlayStation 5, where double-sided drives can face clearance issues.

Key Specifications

• Interface: PCIe 4.0 x4 (NVMe 2.0)
• Sequential Read/Write: 7,450 MB/s / 6,900 MB/s
• Controller: Samsung Pascal (In-house, 8nm)
• NAND: Samsung V-NAND 3-bit MLC (TLC) (Gen 8)
• DRAM Cache: 4GB LPDDR4
• Random Read/Write: Up to 1,600K / 1,550K IOPS
• Endurance (TBW): 2400 TBW
• Features: Single-sided PCB, AES 256-bit Encryption, TCG/Opal 2.0 support

Hardware Alternatives

• WD Black SN850X 4000GB: The primary proprietary rival, utilizing a custom Western Digital controller and BiCS NAND, offering comparable sequential throughput and commonly cross-shopped for high-end PCIe 4.0 workstations.
• SK Hynix Platinum P41 / Solidigm P44 Pro: These drives share the SK Hynix "Aries" controller and 176-layer TLC NAND and are direct competitors in terms of power efficiency and random I/O performance.
• Seagate FireCuda 530: Represents the "Reference Design" high-end alternative, utilizing the Phison E18 controller and Micron 176-layer NAND, with similar sequential speeds and typically higher rated endurance (TBW) in its implementations.