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Lexar NM990 4TB specifications and in-depth review

Lexar NM990 4TB

Manufacturer: Lexar

The Lexar NM990 4TB is a high-capacity M.2 NVMe solid-state drive built around the PCIe 5.0 interface, placing it among the faster storage options in its category. It ships without an integrated heatsink and lacks RGB lighting, keeping the design straightforward and focused on raw storage performance. With 4,000 GB of internal storage, it suits workloads that demand both speed and substantial capacity in a compact form factor.

On the performance side, the Lexar NM990 4TB is rated for sequential read and write speeds of 14,000 MB/s and 11,000 MB/s respectively, while random read performance reaches 2,000,000 IOPS and random write comes in at 1,500,000 IOPS. The drive uses a DRAM cache and an 8-channel controller architecture. Endurance is specified at 3,000 TBW, and Lexar rates the MTBF at 1.5 million hours. It operates up to a maximum temperature of 70 °C, withstands shock loads of 1,500 G, and is backed by a five-year warranty.

Pros
  • Sequential read speed of 14,000 MB/s and sequential write speed of 11,000 MB/s enable fast transfer of large files
  • Random read performance of 2,000,000 IOPS and random write of 1,500,000 IOPS suit workloads involving frequent small data operations
  • 4,000 GB of storage capacity accommodates large libraries of files, projects, or installations
  • DRAM cache supports consistent performance during sustained operations
  • 3,000 TBW endurance rating indicates substantial write longevity over the drive's lifespan
  • Five-year warranty and an MTBF of 1.5 million hours reflect a strong reliability specification
Cons
  • No integrated heatsink, which may require users to source a separate cooling solution for sustained workloads
  • Maximum operating temperature of 70 °C may be a limiting factor in thermally constrained enclosures
  • PCIe 5.0 requires a compatible motherboard slot, limiting usability on older platforms
Who is this for?

This drive is well-suited to users who work with large file transfers on a regular basis, such as video editors, 3D artists, and data engineers who need sustained throughput at the storage level. The high random IOPS figures also make it a strong fit for demanding multitasking and application-heavy environments where many small read and write operations happen concurrently. With 4,000 GB of capacity, a 3,000 TBW endurance rating, and a five-year warranty, it equally suits users who need a high-capacity, long-lasting primary drive for professional or content creation workstations.

Who is this NOT for?

Users on platforms without a PCIe 5.0-compatible M.2 slot will not be able to use this drive, as it requires a motherboard that supports the interface. The absence of an integrated heatsink means it is less suited to compact or thermally restricted builds, such as small form factor systems where airflow is limited and additional cooling accessories may not fit. It is also unnecessary for users with everyday computing needs like web browsing or light office work, where the drive's high-throughput specifications would go largely unused.

Read speed:

sequential read speed 14000 MB/s
random read speed 2000000 IOPS

The Lexar NM990 4TB delivers a sequential read speed of 14,000 MB/s, making it suited for tasks that involve transferring large files at sustained throughput. For workloads built around smaller, scattered data access, the drive is rated at 2,000,000 IOPS for random read operations, reflecting strong performance in scenarios where many small requests are processed concurrently.

Write speed:

sequential write speed 11000 MB/s
random write speed 1500000 IOPS

The Lexar NM990 4TB is rated for a sequential write speed of 11,000 MB/s, supporting sustained throughput when writing large volumes of data in a continuous stream. On the random write side, the drive reaches 1,500,000 IOPS, indicating solid responsiveness under workloads that involve frequent, small write operations spread across the storage space.

Benchmarks:

General info:

type M2
SSD cache DRAM cache
Is an NVMe SSD ✓
internal storage 4000GB
PCI Express (PCIe) version 5
Controller channels 8
Terabytes Written (TBW) 3000
MTBF 1.5million hours
warranty period 5 years
Has an integrated heatsink ✕
maximum operating temperature 70 °C
shock resistance 1500G
has RGB lighting ✕

The Lexar NM990 4TB is an M.2 NVMe SSD that connects via PCIe 5.0 and offers 4,000 GB of internal storage, backed by a DRAM cache and an 8-channel controller. Endurance is rated at 3,000 TBW, and the drive carries an MTBF figure of 1.5 million hours alongside a five-year warranty. It operates at temperatures up to 70 °C and is rated to withstand shock loads of 1,500 G. The drive does not include an integrated heatsink or RGB lighting.

Final Verdict

The Lexar NM990 4TB is a high-capacity M.2 NVMe SSD that targets users who need both substantial storage and demanding throughput in a professional or content-focused workstation. Its 14,000 MB/s sequential read speed paired with 2,000,000 IOPS random read performance place it firmly in the upper tier of PCIe 5.0 storage, and the 3,000 TBW endurance rating alongside a five-year warranty reinforce its credentials as a drive built for long-term, intensive use. The lack of an integrated heatsink and the PCIe 5.0 requirement mean it demands a compatible, well-cooled platform to reach its potential — but for users whose systems meet those requirements, the Lexar NM990 4TB represents a technically well-specified drive that covers both capacity and performance in a single M.2 unit.

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