ADATA LEGEND 900 512GB M.2 SSD
Here you will find a detailed speed, performance and benchmark test review. Tested was the M.2 NVMe SSD LEGEND 900 with 512GB (SLEG-900-512GCS) from the brand ADATA.
| Technical specifications (manufacturer information) | |
| Product image | 
|
| Manufacturer | ADATA |
| Model number | SLEG-900-512GCS |
| Capacity | 512 GB (477 GiB) |
| pSLC cache | 104 GB approx. |
| Read speed | 6200 MB/s |
| Write speed | 2300 MB/s |
| Interface | PCIe 4.0 x4 |
| Connector | M.2 2280 |
| Memory module (NAND) | QLC |
| DRAM cache | No |
| TBW (Total Bytes Written) | 300 terabyte |
| Warranty | 5 Years |
| Controller | Maxio MAP1602 |
Compare product Compared to the test winner*
We put the ADATA NVMe M.2 SSD through a detailed test. You can find the test result / test report here:
AS SSD Benchmark
Standard performance test
The standard test was performed with a 5 GB file. A total score of 5289 points was achieved.
Copy performance test
A common everyday scenario is simulated here. Three test folders are created:
- ISO (folder with two large files)
- Program (folder with many small files)
- Game (folder with small and large files)
The three folders are copied using the Windows copy command (cache remains enabled). The real-world test from 21 July 2025 shows performance during simultaneous write and read operations. The lower the duration, the better.
| AS SSD Copy Benchmark | Transfer rate: | Duration: |
|---|---|---|
| ISO two large files |
2,216.26 MB/s |
1.04 s |
| Program typical program folder with many small files |
1,177.77 MB/s |
5.98 s |
| Game a game folder with small and large files |
2,044.69 MB/s |
3.38 s |
Compression performance test
Here, speed is measured depending on how compressible the data is.
CrystalDiskMark Benchmark
Similar to AS SSD, two sequential and two random performance tests are carried out here and the write and read speed (manufacturer specs: 6200 MB/s and 2300 MB/s) the ADATA SSD is measured.
| CDM | Read [MB/s] | Write [MB/s] |
|---|---|---|
| SEQ1M Q8T1 |
6,308.96 |
2,966.02 |
| SEQ1M Q1T1 |
4,987.88 |
2,970.12 |
| RND4K Q32T16 |
2,334.42 |
1,340.36 |
| RND4K Q1T1 |
78.36 |
190.66 |
IOPS (Input/Output operations per second)
| CDM | Read [IOPS] | Write [IOPS] |
|---|---|---|
| SEQ1M Q8T1 |
6,016.70 |
2,828.60 |
| SEQ1M Q1T1 |
4,756.80 |
2,832.50 |
| RND4K Q32T16 |
569,927.00 |
327,236.00 |
| RND4K Q1T1 |
19,131.10 |
46,547.40 |
Average latency
| CDM | Read [µs] | Write [µs] |
|---|---|---|
| SEQ1M Q8T1 |
1,328.98 |
2,822.83 |
| SEQ1M Q1T1 |
210.07 |
352.72 |
| RND4K Q32T16 |
896.72 |
1,563.10 |
| RND4K Q1T1 |
52.15 |
21.37 |
HD Tune Pro long-term test
A long-term test was performed to fully utilize the storage. You can see at what point the cache (if present) becomes full and write performance drops. A test file of 120 GB was written to the medium. After approx. 104 GB, the cache was full and performance was throttled.
The test file could at least be read with an average read speed of 3,225 MB/s and written at 437 MB/s.
ATTO Disk Benchmark
Here, a 256 MB file is written to the ADATA NVMe M.2 SSD multiple times. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster writing and reading usually becomes.
SSD-Z Benchmark
Similar to HD Tune, a 500 MB file is written to the ADATA NVMe M.2 SSD here. The transfer data is displayed. The more consistent the line, the better. Unfortunately, the tool no longer works correctly from around 4,000 MB/s and no line is displayed (and sometimes incorrect min/max data is shown).
You can find information about the test system at the bottom of the homepage.
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