# Lexar NM990 2TB PCIe 5.0 NVMe SSD Review (2026)

The Lexar NM990 2TB is the sweet spot of the brand's budget PCIe 5.0 line, pairing a DRAM-less Maxio MAP1806A controller with Longsys TLC for 14,000 MB/s reads and a stronger 10,000 MB/s write speed.

Quick answer: The Lexar NM990 2 TB is the model most buyers in this lineup should pick. It pairs the budget Maxio MAP1806A plus Longsys TLC platform with a practical 2 TB capacity, the full 14,000 MB/s read speed, a stronger 10,000 MB/s write figure, a 1,200 TBW rating, a five-year warranty and an included heatsink, all at a low Gen5 price. Its strengths are value, capacity and Gen5 read throughput. Its weaknesses are the DRAM-less HMB design and the absence of prominent random IOPS figures. It suits a budget-conscious buyer who wants PCIe 5.0 read bandwidth plus a usable capacity; skip it if you need sustained random performance or a DRAM cache, in which case a DRAM-equipped Gen5 drive like Lexar's own NM1090 Pro is the better fit.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 2 TB |
| Interface | M.2 5.0 |
| Controller | MaxioTech MAP1806A 8 Channel |
| Memory type | Longsys TLC |
| DRAM cache | HMB (no DRAM) |
| Sequential read | 14000 MB/s |
| Sequential write | 10000 MB/s |
| Random read IOPS |  |
| Random write IOPS |  |
| Endurance | 1200 TBW |
| MTBF | 2000000 |
| Warranty | 5 years |

## Performance

Lexar rates the NM990 2 TB at up to 14,000 MB/s sequential read and 10,000 MB/s sequential write, the strongest balance of read and write in the NM990 family. The read speed matches far more expensive Gen5 flagships, so for game loads, large file reads and DirectStorage-enabled asset streaming the drive feels genuinely fast, while the 10,000 MB/s write figure is a clear step up from the 1 TB's 7,500 MB/s thanks to more NAND die in parallel. Every NM990 capacity shares the 14,000 MB/s read rating, while write scales from 7,500 MB/s on the 1 TB up to 11,000 MB/s on the 4 TB, placing the 2 TB in the middle.

Because the NM990 is DRAM-less and relies on HMB, sustained random performance under heavy mixed workloads is lower than on DRAM-equipped drives, though for everyday desktop use and gaming the difference is rarely noticeable. The drive does not publish prominent random IOPS figures, which itself signals the value positioning. The Maxio MAP1806A is an 8-channel PCIe 5.0 controller, so the sequential throughput is real rather than aspirational, and the included heatsink helps it hold speed under load. For a budget Gen5 boot, game and media drive where reads dominate, the NM990 2 TB delivers the best value in the range.

## Endurance, TBW & Warranty

Lexar backs the NM990 with a five-year limited warranty, and the 2 TB model carries a 1,200 TBW (terabytes written) endurance rating. That is solid coverage for a budget Gen5 drive: 1,200 TBW works out to roughly 658 GB of writes every single day for five years, which comfortably exceeds a typical 20 to 50 GB daily consumer workload, so for ordinary gaming and desktop use the NAND outlasts the warranty term by decades. The five-year term is the binding limit, and it is generous for a value Gen5 drive where three-year cover is common. As an established brand Lexar offers a global support and RMA network, which is reassuring on a budget drive, so keep your proof of purchase. The DRAM-less design means heavy sustained-write workloads are not this drive's strength, but endurance itself is not a realistic concern within the five-year window.

## Pros and Cons

**Pros:**

- Budget PCIe 5.0 with 14,000 MB/s reads
- 10,000 MB/s write, the best balance in the NM990 family
- 2 TB sweet-spot capacity
- Maxio MAP1806A 8-channel Gen5 controller
- Heatsink included
- 5-year warranty
**Cons:**

- DRAM-less HMB design limits sustained random performance
- Random IOPS figures not prominently published
- Needs a PCIe 5.0 platform to justify the read speed
- Lower write speed than DRAM-equipped Gen5 flagships


## Verdict

The Lexar NM990 2 TB is the model most buyers in this lineup should pick. It pairs the budget Maxio MAP1806A plus Longsys TLC platform with a practical 2 TB capacity, the full 14,000 MB/s read speed, a stronger 10,000 MB/s write figure, a 1,200 TBW rating, a five-year warranty and an included heatsink, all at a low Gen5 price. Its strengths are value, capacity and Gen5 read throughput. Its weaknesses are the DRAM-less HMB design and the absence of prominent random IOPS figures. It suits a budget-conscious buyer who wants PCIe 5.0 read bandwidth plus a usable capacity; skip it if you need sustained random performance or a DRAM cache, in which case a DRAM-equipped Gen5 drive like Lexar's own NM1090 Pro is the better fit.

## Frequently Asked Questions

### Is the Lexar NM990 2TB good for gaming?

Yes. With 14,000 MB/s reads the NM990 2 TB handles fast game loads and DirectStorage-era titles with ease, and the 2 TB capacity holds an operating system and a large game library comfortably. The 10,000 MB/s write is more than adequate for gaming, which is read-heavy. It is a strong value pick for a budget Gen5 gaming build, offering the best balance of capacity and write speed in the NM990 range.

### Is the Lexar NM990 2TB 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 NM990 runs at Gen4 speeds rather than its full 14,000 MB/s. Conveniently the NM990 ships with a heatsink, which PS5 installation requires. The 2 TB is a popular PS5 capacity for a large installed library, though a cheaper native PCIe 4.0 drive offers similar PS5 performance for less.

### Does the Lexar NM990 have a DRAM cache?

No, the NM990 is a DRAM-less design that uses HMB (Host Memory Buffer), borrowing a small slice of system memory to manage the flash translation layer. This keeps cost and power draw low, which suits the drive's budget positioning, but it means sustained random performance under heavy mixed workloads is lower than on drives with a dedicated DRAM cache. For everyday and gaming use, which are read-heavy, the difference is rarely noticeable.

### What is the TBW endurance of the Lexar NM990 2TB?

The 2 TB NM990 is rated at 1,200 TBW (terabytes written) over its life, backed by a five-year warranty. That works out to roughly 658 GB of writes per day for five years, which covers a typical 20 to 50 GB daily consumer workload, so the NAND outlasts the warranty by decades. Endurance is not a realistic concern for gaming or everyday desktop use on this drive.

### How does the Lexar NM990 2TB compare to the 1TB and 4TB models?

All three capacities share the same Maxio MAP1806A controller, Longsys TLC NAND, 14,000 MB/s read speed and five-year warranty, but write speed scales with capacity: the 1 TB writes at 7,500 MB/s, the 2 TB at 10,000 MB/s and the 4 TB at 11,000 MB/s. The 2 TB is the sweet spot, pairing a practical capacity with a much stronger write speed than the 1 TB at a lower price than the 4 TB. Most buyers should pick the 2 TB.

### How does the Lexar NM990 compare to the Lexar NM1090 Pro?

Both are Lexar PCIe 5.0 drives but they target different buyers. The NM1090 Pro is the flagship with a Silicon Motion SM2508 controller, Micron TLC, a DRAM cache, higher IOPS and higher write speeds. The NM990 is the value DRAM-less option using Maxio's MAP1806A and Longsys TLC, with 14,000 MB/s reads but lower writes and no DRAM. Choose the NM1090 Pro for peak Gen5 performance; choose the NM990 for Gen5 read speed and capacity at the lowest price.

### Does the Lexar NM990 2TB need a heatsink?

It already includes one. The NM990 ships with a heatsink fitted, which is a thoughtful inclusion for a budget Gen5 drive given how hot PCIe 5.0 parts run under sustained writes. That makes it convenient for PS5 installation and for desktop boards that lack a dedicated M.2 heatsink. You do not need to buy a separate heatsink for this drive.

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Last updated: 2026-06-28. Source: https://ssdrive.net/lexar-nm990-2-tb