Nextorage NN5HE 2 TB: high-capacity DRAM-less PCIe 5.0 flagship (2026)
The Nextorage NN5HE 2 TB is a PCIe 5.0 x4 NVMe SSD from the G Series HE line, built on the Phison PS5031-E31T controller with 3D TLC NAND and a host-memory-buffer design, rated 10,300 MB/s reads and 8,600 MB/s writes with 1,200 TBW of endurance and a 5-year warranty.
Controller & Memory
Nextorage, the Japanese storage brand spun off from Sony in 2019, positions the NN5HE as its G Series HE (High-End) PCIe 5.0 flagship. The 2 TB is the larger of the two capacities and the better-rounded choice: with more NAND dies it carries a higher write rating (8,600 MB/s), a larger SLC write cache, and double the endurance of the 1 TB at 1,200 TBW. The controller is the Phison PS5031-E31T — a four-channel, DRAM-less Gen5 design on TSMC 7nm that uses the host memory buffer rather than an on-board DRAM chip.
The E31T approach trades a dedicated DRAM cache for lower heat and power while still hitting the 10 GB/s class. At 2 TB the larger NAND array narrows the practical gap to DRAM-equipped E26 drives in sustained workloads, because the bigger SLC cache absorbs more of a transfer before throughput settles. The single-sided M.2 2280-S3-M layout helps a heatsink make contact and suits compact builds.
This is a PC PCIe 5.0 drive that needs a Gen5 M.2 slot to reach its rated speeds; in a Gen4 slot it caps near 7 GB/s. It is not a PlayStation 5 drive — the PS5 uses PCIe 4.0. The 2 TB NN5HE is best matched to a high-end desktop or workstation with a free Gen5 socket, adequate M.2 cooling, and a need for both speed and capacity.
Storage Comparisons:
NN5HE Performance & Benchmarks
The NN5HE 2 TB is rated at 10,300 MB/s sequential reads and 8,600 MB/s sequential writes over PCIe 5.0 x4, with 1,300,000 random read IOPS and 1,500,000 random write IOPS — top-tier consumer NVMe figures. The 2 TB's write rating is slightly higher than the 1 TB's, reflecting the greater NAND parallelism.
Nextorage NN5HE 2 TB vs M.2 5.0 x 4 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 5.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- Kioxia Exceria Pro G2 2 TB: 14,900 MB/s read, 13,400 MB/s write
- Kioxia Exceria Pro G2 4 TB: 14,900 MB/s read, 13,700 MB/s write
- PNY XLR8 CS3250 4 TB: 14,900 MB/s read, 13,500 MB/s write
- Samsung 9100 Pro 4 TB: 14,800 MB/s read, 13,400 MB/s write
- Nextorage NN5HE 2 TB (this drive): 10,300 MB/s read, 8,600 MB/s write
The E31T's strength is delivering this performance with lower heat and power than eight-channel E26 designs, reducing thermal-throttling risk during sustained transfers when used with a motherboard or aftermarket M.2 heatsink. The larger SLC cache on the 2 TB means it sustains big sequential writes longer than the 1 TB before settling to native TLC speed, which remains fast at this tier. For gaming and general desktop use, the real-world gap to DRAM-equipped Gen5 rivals is small.
Nextorage NN5HE vs Competitors
See how the NN5HE stacks up against other M.2 5.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
Nextorage covers the NN5HE with a 5-year warranty. The 2 TB model is rated for 1,200 TBW (terabytes written) and an MTBF of 1,500,000 hours, with coverage ending at whichever limit comes first: five years from purchase or 1,200 TBW of cumulative writes.
At a typical 30 GB of writes per day, reaching 1,200 TBW would take well over a century, so the 5-year term is the only practical limit. Even at a sustained 100 GB per day, the endurance rating spans about 32 years. For desktop and gaming workloads the TBW ceiling is irrelevant in practice; the warranty length is the binding factor.
Nextorage NN5HE 2 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 2 TB |
| Interface [?] | M.2 5.0 x 4 |
| Controller [?] | Phison PS5031-E31T |
| Memory type [?] | 3D TLC |
| DRAM [?] | No |
| Read speed (MB/s) [?] | 10300 |
| Write speed (MB/s) [?] | 8600 |
| Read IOPS [?] | 1300000 |
| Write IOPS [?] | 1500000 |
| Endurance (TBW) [?] | 1200 |
| MTBF (million hours) [?] | 1500000 |
| Warranty (years) [?] | 5 |
Verdict: Is the NN5HE Worth It in 2026?
The Nextorage NN5HE 2 TB is the better-balanced model in the G Series HE line: 10,300/8,600 MB/s performance, a larger SLC cache and 1,200 TBW endurance, the efficiency of the DRAM-less Phison E31T, and a 5-year warranty from a Sony-derived Japanese brand.
It is a strong pick for a high-end PCIe 5.0 desktop that needs both Gen5 speed and 2 TB of capacity with lower heat and power than first-generation E26 drives. Buyers who want a dedicated DRAM cache for the highest sustained consistency might prefer an E26-based Gen5 drive, and anyone on a PCIe 4.0 platform should choose a Gen4 SSD, as the NN5HE only delivers its rated speeds in a Gen5 slot.
+ Pros
- PCIe 5.0 x4 performance at 10,300/8,600 MB/s
- Higher write rating and larger SLC cache than the 1 TB
- 1,200 TBW endurance with a 5-year warranty
- Phison E31T runs cooler and lower-power than eight-channel E26 designs
- High random IOPS: 1.3M read / 1.5M write
- Single-sided M.2 2280 aids cooling and compact-system fit
- Cons
- DRAM-less (HMB) — no dedicated DRAM cache
- Requires a PCIe 5.0 slot for rated speeds; falls back to ~7 GB/s on Gen4
- Not compatible as a PlayStation 5 expansion drive (PS5 is Gen4)
- Needs active or motherboard M.2 cooling under sustained load
- Limited Western retail availability
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Video Review
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