# Lexar NM1090 Pro 4TB PCIe 5.0 NVMe SSD Review (2026)

The Lexar NM1090 Pro 4TB tops Lexar's PCIe 5.0 flagship line, pairing a Silicon Motion SM2508 controller with Micron 232-layer TLC for 14,000 MB/s reads and maximum capacity.

Quick answer: The Lexar NM1090 Pro 4 TB is the top of the brand's PCIe 5.0 line, pairing the proven Silicon Motion SM2508 plus Micron 232-layer TLC platform with maximum 4 TB capacity, the full headline 14,000 MB/s read speed, around 2.1 million random read IOPS, a 2,800 TBW rating and a five-year warranty at a competitive price. Its strengths are flagship Gen5 performance and the largest capacity in the range in one drive. Its caveats are the usual Gen5 ones plus price: it needs a PCIe 5.0 platform to shine, it carries the lineup's highest cost, and most buyers are better served by the 2 TB sweet spot. Choose it if you need maximum fast storage plus top-tier throughput; skip it if your board only supports PCIe 4.0 or if 2 TB is enough.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 5.0 |
| Controller | Silicon Motion SM2508 8 Channel |
| Memory type | Micron 232-L TLC |
| DRAM cache | Yes |
| Sequential read | 14000 MB/s |
| Sequential write | 12000 MB/s |
| Random read IOPS | 2100000 |
| Random write IOPS | 1700000 |
| Endurance | 2800 TBW |
| MTBF | 1500000 |
| Warranty | 5 years |

## Performance

Lexar rates the NM1090 Pro 4 TB at up to 14,000 MB/s sequential read and 12,000 MB/s sequential write, with around 2,100,000 random read and 1,700,000 random write IOPS. Those are flagship PCIe 5.0 figures, with the 4 TB reaching the family's full headline read speed; its sequential write of 12,000 MB/s sits just under the 2 TB's 13,000 MB/s, a minor trade-off for the larger capacity. In day-to-day use that sequential headroom shows up when moving large files, game libraries, video projects or virtual machine images, and at 4 TB there is room to keep a large library of them on the fast tier. For ordinary booting and browsing the gap to a good PCIe 4.0 drive is smaller than the raw numbers suggest.

Where Gen5 earns its keep is sustained throughput and high-queue-depth random performance, where the SM2508 controller and its roughly 2.1 million random read IOPS hold up well. The SM2508 is one of the more efficient PCIe 5.0 designs, which helps the NM1090 Pro hold its peak performance under sustained loads rather than throttling as aggressively as some early Gen5 parts. Independent reviewers confirm the NM1090 Pro reaches its advertised sequential figures and behaves as a solid, efficient flagship. For a 4 TB drive used for bulk fast storage plus a boot and game volume on a PCIe 5.0 platform, it delivers genuine flagship Gen5 performance with maximum capacity.

## Endurance, TBW & Warranty

Lexar backs the NM1090 Pro with a five-year limited warranty, and the 4 TB model carries a 2,800 TBW (terabytes written) endurance rating, the highest in the lineup. That matches other PCIe 5.0 flagships: 2,800 TBW works out to roughly 1,534 GB of writes every single day for five years, staggeringly more than a typical 20 to 50 GB daily consumer workload. At 50 GB of writes per day you would need around 153 years to exhaust the rated endurance, so the NAND will outlast the warranty term many times over and wear is simply not a concern, even on a 4 TB drive holding a large media library. The five-year term is the binding limit, and it matches the coverage on competing Gen5 drives. Lexar is an established brand with a global support and RMA network, which is reassuring on a 4 TB drive likely to accumulate a lot of data, so keep your proof of purchase and register the drive if prompted.

## Pros and Cons

**Pros:**

- PCIe 5.0 Silicon Motion SM2508 platform
- Flagship 14,000 MB/s sequential read
- Maximum 4 TB capacity in a single M.2 slot
- Micron 232-layer 3D TLC with DRAM cache
- 2,800 TBW endurance rating
- 5-year warranty
**Cons:**

- Highest price in the NM1090 Pro lineup
- Needs a PCIe 5.0 platform to justify the speed
- Sequential write slightly lower than the 2 TB model
- No heatsink on the base SKU


## Verdict

The Lexar NM1090 Pro 4 TB is the top of the brand's PCIe 5.0 line, pairing the proven Silicon Motion SM2508 plus Micron 232-layer TLC platform with maximum 4 TB capacity, the full headline 14,000 MB/s read speed, around 2.1 million random read IOPS, a 2,800 TBW rating and a five-year warranty at a competitive price. Its strengths are flagship Gen5 performance and the largest capacity in the range in one drive. Its caveats are the usual Gen5 ones plus price: it needs a PCIe 5.0 platform to shine, it carries the lineup's highest cost, and most buyers are better served by the 2 TB sweet spot. Choose it if you need maximum fast storage plus top-tier throughput; skip it if your board only supports PCIe 4.0 or if 2 TB is enough.

## Frequently Asked Questions

### Is the Lexar NM1090 Pro 4TB good for gaming?

Yes, though it is a luxury pick. With 14,000 MB/s reads and around 2.1 million random read IOPS the NM1090 Pro 4 TB offers ample headroom for DirectStorage-era games, and the 4 TB capacity holds an enormous game library alongside the operating system with room to spare. PCIe 5.0 makes little difference to load times versus PCIe 4.0 in current titles, so the draw is capacity plus Gen5 headroom. It will run games flawlessly; the trade-off is price versus a cheaper Gen4 4 TB drive.

### Is the Lexar NM1090 Pro 4TB compatible with the PS5?

Yes. The PS5 accepts standard M.2 2280 NVMe drives and PCIe 5.0 is backward compatible, but the PS5 expansion slot is PCIe 4.0, so the NM1090 Pro runs at Gen4 speeds rather than its full 14,000 MB/s. A heatsink is required for PS5 installation, since Gen5 drives run hot under sustained writes. At 4 TB it is an excellent PS5 upgrade for players who want a huge library always installed, though a cheaper Gen4 drive offers similar PS5 performance for less.

### Does the Lexar NM1090 Pro have a DRAM cache?

Yes. The NM1090 Pro pairs the Silicon Motion SM2508 controller with a DRAM cache alongside the Micron 232-layer TLC NAND. A DRAM cache speeds up the flash translation layer for faster random access and more consistent sustained performance than DRAM-less designs, which matters on a 4 TB drive holding an operating system, games and large project files. It is one reason the NM1090 Pro holds up under mixed and heavy workloads.

### What is the TBW endurance of the Lexar NM1090 Pro 4TB?

The 4 TB NM1090 Pro is rated at 2,800 TBW (terabytes written) over its life, the highest in the lineup, backed by a five-year warranty. That is roughly 1,534 GB of writes per day for five years, far beyond any normal 20 to 50 GB daily workload, so the NAND outlasts the warranty by more than a century in typical use. Endurance is not a concern even on a drive this large.

### How does the Lexar NM1090 Pro 4TB compare to the 1TB and 2TB models?

All three capacities share the same Silicon Motion SM2508 controller, Micron 232-layer TLC NAND and five-year warranty, but the 4 TB is the only one to reach 4 TB and posts the family's highest endurance at 2,800 TBW, with the full 14,000 MB/s read speed. Its 12,000 MB/s sequential write is slightly lower than the 2 TB's 13,000 MB/s. The 2 TB remains the value sweet spot with full flagship speed; the 4 TB is for buyers who specifically need the maximum capacity and top throughput in one drive.

### How does the Lexar NM1090 Pro compare to the Crucial T705?

Both are PCIe 5.0 flagships, but they use different controllers: the NM1090 Pro uses the Silicon Motion SM2508 while the Crucial T705 uses the Phison E26. Peak performance is comparable at the top end, with both reaching roughly 14,000 MB/s reads on the larger capacities. The Crucial T705 is the more established product with a longer review track record, while the NM1090 Pro is often positioned as the more affordable route onto the Gen5 platform. For a 4 TB investment both are credible; choose on price and local warranty support.

### Does the Lexar NM1090 Pro 4TB need a heatsink?

Yes, in most builds. PCIe 5.0 drives run hot under sustained writes, and the base NM1090 Pro ships as a bare M.2 2280 stick, though heatsink and heatsink-plus-fan SKUs exist. Most modern PC motherboards include an M.2 heatsink that covers the drive, which is enough for typical use, but PS5 installs and boards without a dedicated M.2 heatsink need an aftermarket Gen5-compatible heatsink to prevent thermal throttling under sustained writes.

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Last updated: 2026-06-28. Source: https://ssdrive.net/lexar-nm1090-4-tb