# 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.

Quick answer: 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.

## Specifications

| Specification | Value |
| --- | --- |
| Capacity | 4 TB |
| Interface | M.2 4.0 x 4 |
| Controller | Silicon Motion  SM2268XT2 |
| Memory type | YMTC QLC |
| DRAM cache | HMB |
| Sequential read | 7400 MB/s |
| Sequential write | 6500 MB/s |
| Random read IOPS |  |
| Random write IOPS |  |
| Endurance | 2400 TBW |
| MTBF | 1500000 |
| Warranty | 5 years |

## Performance

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.

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.

## 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.

## Pros and Cons

**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


## Verdict

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.

## Frequently Asked Questions

### Is the ADATA Legend 900 Pro 4 TB good for gaming?

The ADATA Legend 900 Pro 4 TB is adequate for gaming, though it is not the drive a performance-focused builder would pick first. It hits 7,400 MB/s sequential reads on PCIe 4.0, which is plenty of bandwidth for game loading, and the bundled thin heatsink keeps temperatures in check during long sessions. In practice, game load times are usually bounded by the CPU and asset decompression rather than storage, so the gap between this drive and a faster PCIe 4.0 model is small in most titles. The real strength of the 4 TB over the smaller capacities is raw headroom: four terabytes holds an entire large game library with room to spare, which makes it the strongest pick in the family for buyers who want to install everything and stop managing space.

### Does the ADATA Legend 900 Pro 4 TB work in a PS5?

Yes, the ADATA Legend 900 Pro 4 TB works in a PlayStation 5 and the bundled heatsink handles Sony's requirement out of the box. Sony recommends an M.2 NVMe SSD with at least 5,500 MB/s sequential reads and dimensions within 110 by 25 by 11.25 millimetres including a heatsink, and the 4 TB clears both: it reads at 7,400 MB/s and the included heatsink brings total height to 3.43 millimetres, well under the 11.25 millimetre ceiling. The console's expansion slot is PCIe 4.0, so the drive runs at full speed rather than being capped to PCIe 3.0. The 4 TB is the max-capacity option in the family, ideal for a PS5 owner who wants to install a large game library without worrying about free space for years.

### What is the TBW endurance of the ADATA Legend 900 Pro 4 TB?

The ADATA Legend 900 Pro 4 TB carries a 2,400 TBW endurance rating, the ceiling of a family that starts at 600 TBW on the 1 TB and climbs through 1,200 TBW on the 2 TB, confirmed in the ADATA datasheet and matching the 2.4 PBW figure johnnylucky.org publishes as the family maximum. At a typical consumer workload of around 20 GB of writes per day, the drive would need roughly 329 years to exhaust the NAND, so the five-year warranty term expires long before the flash wears out. The 2,400 TBW figure matters most for buyers running heavy write workloads like video capture, large database writes or daily bulk file transfers, though even there the 4 TB has more endurance headroom than any smaller capacity in the line.

### Does the ADATA Legend 900 Pro have a DRAM cache?

The ADATA Legend 900 Pro does not have a DRAM cache. It uses a DRAM-less design built around Silicon Motion's SM2268XT2 four-channel controller, and instead of a discrete DRAM chip it relies on the Host Memory Buffer protocol to borrow a small slice of the system's RAM for its flash-mapping tables. This is a common cost-saving choice in budget PCIe 4.0 drives and has little practical impact on everyday reads, boot times and game loading. The trade-off shows up under heavy sustained random writes, where a DRAM-less drive can fall behind a DRAM-equipped model; for a 4 TB bulk-storage drive the HMB design is acceptable, but it is part of why the Legend 900 Pro sits in the budget tier rather than the performance tier.

### Is the 4 TB version slower than the smaller capacities?

No, not on sequential bandwidth. ADATA rates all three capacities of the Legend 900 Pro family at the same 7,400 MB/s sequential reads and 6,500 MB/s sequential writes, and the independent Funky Kit review of the 2 TB confirmed the platform holds those numbers in CrystalDiskMark, even slightly exceeding the rated writes at over 6,800 MB/s. Where the 4 TB differs is endurance: it carries the highest 2,400 TBW rating against 1,200 TBW on the 2 TB and 600 TBW on the 1 TB, the standard QLC scaling with capacity. ADATA does not publish per-capacity random IOPS, so the only data point is the 2 TB's measured over one million IOPS, which the 4 TB should approach on the same SM2268XT2 plus YMTC QLC platform.

### Does the ADATA Legend 900 Pro 4 TB need a heatsink?

No extra heatsink is required for the ADATA Legend 900 Pro 4 TB, because the drive ships with one in the box. The 4 TB includes a thin metal heatsink that brings the module's total height to 3.43 millimetres, enough to satisfy Sony's PlayStation 5 expansion-slot requirement and to keep the drive cool under typical desktop and laptop loads. In the Funky Kit review of the 2 TB sibling, which shares the same cooling design, temperatures ranged between 35 and 70 degrees Celsius with no thermal throttling observed, well below the 85 degree ceiling for consumer NVMe. Buyers who already have a motherboard M.2 heatsink can remove the bundled one, since the bare module is just 2.15 millimetres tall and fits even tighter laptop slots.

### What controller and NAND does the ADATA Legend 900 Pro use?

The ADATA Legend 900 Pro uses Silicon Motion's SM2268XT2 four-channel NVMe controller paired with rebranded 3D NAND that independent reviewers identify as YMTC's QLC family, a DRAM-less combination running over a PCIe 4.0 x4 link on the NVMe 1.4 standard. The Funky Kit review of the 2 TB confirmed the SM2268XT2 and YMTC QLC identification after removing the heatsink, matching the ADATA datasheet's controller listing and the drive's sustained-write behaviour. The SM2268XT2 is Silicon Motion's value-tier DRAM-less PCIe 4.0 controller, and the YMTC QLC NAND trades raw sustained write speed and endurance per gigabyte for low cost and high density. This controller-plus-NAND recipe defines the Legend 900 Pro's performance profile across all three capacities, including the 4 TB flagship.

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Last updated: 2026-07-17. Source: https://ssdrive.net/adata-legend-900-pro-4-tb