Between the NM800 Pro 2TB and 990 PRO 2TB, the NM800 Pro 2TB comes out ahead in endurance (tbw) and sequential read, while the 990 PRO 2TB wins on sequential write. Overall, the NM800 Pro 2TB scores 69.6 and the 990 PRO 2TB scores 70.1 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (69.6 vs 70.1). The decision isn't about overall quality — both clear the bar — it's about which specific trade-offs fit your use.
Pick the NM800 Pro 2TB if you care most about endurance (tbw) and sequential read. The biggest gaps in its favor are endurance (tbw), sequential read.
Pick the 990 PRO 2TB if you care most about sequential write. Its strongest claims are sequential write.
Both ship with comparable capacity, interface, so those specs don't separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Lexar - NM800 Pro 2TB wins
- ▲Endurance (TBW) — 25.00% more. 1500 vs 1200.
- ▲Sequential read — 0.67% more. 7500 MB/s vs 7450 MB/s.
Why Samsung - 990 PRO 2TB wins
- ▲Sequential write — 6.15% more. 6900 MB/s vs 6500 MB/s.
Spec comparison
Capacity
| Spec | Lexar - NM800 Pro 2TB | Samsung - 990 PRO 2TB |
|---|---|---|
| Capacity | 2000 GB | 2000 GB |
Performance
| Spec | Lexar - NM800 Pro 2TB | Samsung - 990 PRO 2TB |
|---|---|---|
| Sequential read | 7500 MB/slead | 7450 MB/s |
| Sequential write | 6500 MB/s | 6900 MB/slead |
| Interface | PCIe 4.0 x4 | PCIe 4.0 x4 |
| Form factor | M.2 2280 | M.2 2280 |
Endurance
| Spec | Lexar - NM800 Pro 2TB | Samsung - 990 PRO 2TB |
|---|---|---|
| Endurance (TBW)ⓘ | 1500lead | 1200 |
| Warranty | 5 yrs | 5 yrs |
Spec-level deep dives
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