ADATA Legend 900 Pro 4 TB: Max-Capacity QLC Gen4 NVMe (2026)
The ADATA Legend 900 Pro 4 TB is the max-capacity SKU of ADATA's budget PCIe 4.0 QLC line, pairing a DRAM-less SM2268XT2 with the family's strongest 2,400 TBW endurance and a bundled PS5-ready heatsink.
Controller & Memory
The ADATA Legend 900 Pro 4 TB is the max-capacity flagship of ADATA's budget PCIe 4.0 QLC line, a DRAM-less drive built on a Silicon Motion SM2268XT2 four-channel controller paired with rebranded 3D NAND that independent reviewers identify as YMTC's QLC family. The drive runs over a PCIe 4.0 x4 link on the NVMe 1.4 standard, and because there is no discrete DRAM on the PCB it leans on the Host Memory Buffer protocol to borrow a slice of system RAM for its flash-mapping tables. ADATA ships the Legend 900 Pro as a single-sided M.2 2280 module with a thin bundled metal heatsink that brings total height to 3.43 millimetres, enough to clear Sony's PlayStation 5 expansion requirement without fouling laptop slot clearance.
Within the Legend 900 Pro family, which also spans a 1 TB sibling and a 2 TB middle capacity, the 4 TB is the endurance and capacity flagship. ADATA rates all three sizes identically at 7,400 MB/s sequential read and 6,500 MB/s sequential write, so the 4 TB carries the same headline bandwidth as the rest of the line; what scales with capacity is endurance. The 4 TB's 2,400 TBW rating is the family ceiling, doubling the 1,200 TBW of the 2 TB and quadrupling the 600 TBW of the 1 TB, and it matches the 2.4 PBW figure johnnylucky.org publishes as the family maximum. That endurance, combined with the four-terabyte capacity, positions the drive as bulk QLC storage for a large game library, a media archive, or a PlayStation 5 maxed out at its expansion-slot ceiling. No dedicated independent review of the 4 TB exists at research time; the verified benchmark data comes from Funky Kit's review of the 2 TB, which shares the same SM2268XT2 plus YMTC QLC platform.
Compatibility is one of the Legend 900 Pro's stronger selling points: the bundled heatsink means the drive meets Sony's PS5 expansion requirement out of the box, the single-sided PCB fits thin laptops, and PCIe 4.0 backward compatibility drops it to PCIe 3.0 rates in older slots. The direct rivals at this capacity are the same tier of budget QLC and DRAM-less PCIe 4.0 drives, including the Kingston NV2, the Crucial P3 and the Acer FA200 that shares the YMTC QLC plus DRAM-less recipe, while the WD Blue SN580 remains the TLC alternative for buyers who care about sustained writes. The Legend 900 Pro's real distinction is the included heatsink, the max-capacity option in a family that tops out at 4 TB, and the SM2268XT2 platform rather than any headline bandwidth advantage over its rivals.
Storage Comparisons:
Legend 900 Pro Performance & Benchmarks
On the ADATA Legend 900 Pro 4 TB, ADATA rates sequential reads at up to 7,400 MB/s and sequential writes at up to 6,500 MB/s over a PCIe 4.0 x4 link, the same headline figures quoted across all three capacities in the family. ADATA does not publish random read or write IOPS ratings for the Legend 900 Pro, which is unusual for a modern NVMe drive; the only independent data point is the Funky Kit review of the 2 TB sibling, which measured over one million IOPS in CrystalDiskMark's random test alongside over 7,100 MB/s sequential reads and over 6,800 MB/s writes, slightly above spec. ATTO on the same 2 TB sample landed at 6.64 GB/s reads and 6.37 GB/s writes, the usual small under-spec gap ATTO shows relative to CrystalDiskMark. Because all three capacities share the same SM2268XT2 plus YMTC QLC platform, the headline bandwidth should hold on the 4 TB, though no dedicated 4 TB benchmark exists at research time to confirm it directly.
ADATA Legend 900 Pro 4 TB vs M.2 4.0 x 4 peers
Switch between sequential throughput and random IOPS to see how this drive stacks up against other M.2 4.0 x 4 SSDs in our database. The highlighted bar is the drive on this page — click any other bar to open that drive.
- WESTERN DIGITAL SN8100 1 TB: 14,900 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 1 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 2 TB: 14,500 MB/s read, 14,000 MB/s write
- Patriot Viper PV593 4 TB: 14,500 MB/s read, 14,000 MB/s write
- ADATA Legend 900 Pro 4 TB (this drive): 7,400 MB/s read, 6,500 MB/s write
The honest caveat is QLC sustained-write behaviour, and it is sharpest at the 4 TB capacity where buyers are most likely to push large transfers. The YMTC QLC NAND and the SLC cache algorithm hold the rated 6,500 MB/s only while the cache has room, and once it fills the drive settles to the native QLC write rate, which on this class of drive can fall well below 1,000 MB/s and is most visible during large file transfers, video capture or bulk backup jobs of hundreds of gigabytes. For boot, everyday desktop use and game loading the cache rarely exhausts and the drive feels every bit a PCIe 4.0 NVMe, with game load times bounded more by CPU and asset decompression than by storage. The bundled thin heatsink kept the 2 TB review sample between 35 and 70 degrees Celsius with no thermal throttling observed across Funky Kit's test suite, well under the 85 degree ceiling for consumer NVMe, and the same cooling design carries over to the 4 TB.
ADATA Legend 900 Pro vs Competitors
See how the Legend 900 Pro stacks up against other M.2 4.0 x 4 drives in our database:
Compare with rival drives:
Endurance, TBW & Warranty
The ADATA Legend 900 Pro 4 TB carries a five-year limited warranty that ends early if the 2,400 TBW endurance rating is exceeded, whichever comes first. The 2,400 TBW figure is the ceiling of a family that starts at 600 TBW on the 1 TB and climbs through 1,200 TBW on the 2 TB, scaling with capacity under the YMTC QLC endurance profile and confirmed in the ADATA datasheet that Funky Kit reproduces; johnnylucky.org independently lists the family maximum at 2.4 PBW, which is this 4 TB. At a typical consumer write workload of around 20 GB per day the 4 TB would need roughly 329 years to exhaust the NAND, so in practice the warranty term expires long before the flash wears out; even a heavier 50 GB-per-day routine still clears 131 years. ADATA rates the drive at up to 1.5 million hours MTBF, but that figure is a population-reliability statistic describing expected failures across a large fleet, not a lifespan guarantee for any single unit.
ADATA Legend 900 Pro 4 TB Specifications
| Category | Value |
|---|---|
| Capacity [?] | 4 TB |
| Interface [?] | M.2 4.0 x 4 |
| Controller [?] | Silicon Motion SM2268XT2 |
| Memory type [?] | YMTC QLC |
| DRAM [?] | HMB |
| Read speed (MB/s) [?] | 7400 |
| Write speed (MB/s) [?] | 6500 |
| Read IOPS [?] | 0 |
| Write IOPS [?] | 0 |
| Endurance (TBW) [?] | 2400 |
| MTBF (million hours) [?] | 1500000 |
| Warranty (years) [?] | 5 |
Verdict: Is the Legend 900 Pro Worth It in 2026?
Buy the ADATA Legend 900 Pro 4 TB as a max-capacity bulk-storage drive in a PCIe 4.0 desktop, laptop or PlayStation 5 where the bundled heatsink clears the PS5 requirement out of the box, the 2,400 TBW endurance is enough for years of normal use, and the asking price per terabyte matters more than peak sustained writes. Skip it for a video editing scratch disk, a constant large-file ingest workload, or any build where the QLC NAND's drop past the SLC cache will be felt during sustained transfers of hundreds of gigabytes. The stronger alternative in the same tier is a TLC drive like the WD Blue SN580, which holds sustained writes better at this capacity, or a QLC rival like the Crucial P3 4 TB if the goal is raw capacity rather than the bundled heatsink. The verdict on the ADATA Legend 900 Pro 4 TB is a max-capacity, no-frills QLC NVMe whose real draw is the included heatsink, the 2,400 TBW endurance ceiling and the four-terabyte headroom rather than any performance distinction.
+ Pros
- 7,400 MB/s sequential reads on PCIe 4.0
- 2,400 TBW is the family endurance ceiling
- 4 TB is the max capacity in the line
- Bundled thin heatsink included in box
- Single-sided M.2 2280 fits laptops and PS5
- DRAM-less SM2268XT2 with YMTC QLC NAND
- Five-year warranty, TBW-limited
- Cons
- QLC NAND drops sharply past the SLC cache
- ADATA does not publish random IOPS ratings
- No DRAM cache, relies on host HMB
- Sustained writes fall well below TLC rivals
- 4 TB has no dedicated independent review
- QLC caveats strongest at the highest capacity
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Video Review
ADATA Legend 900 2TB SSD Review: Speed Meets Performance
