Average Bench: 77% (522nd of 1058)

Based on 5,673 user benchmarks.  Models: ADATA SX900, ADATA SX 900, ADAT SX900, ADATA SSD SX900 256GB-, ADATA SSD SX900 256GB-DL2-TCG

The SX900 and SX910 are both Sandforce 2881 based SSDs from Adata. The only difference between them is their warranty period: 5 years for the SX910 vs 3 years for the SX900. Both drives utilize Intel-Micron 25Nm MLC so the differences must be at a "sub-atomic" level, or at least beyond the scope of the specs. Once again as with all Sandforce 2881 based drives performance is skewed in favour of reads over writes. With a peak sequential read of 510 MB/s and corresponding sequential write of 309 MB/s the SX series does not break any records but, like all SSDs, they do offer speeds way in excess of mechanical hard drives. Overall performance lags the SSD group leaders by around 40% and there are far faster, cheaper and newer (non-Sandforce) alternatives such as the Samsung 840 Evo or the Sandisk Ultra Plus available. [Jan '14 SSDrivePro]

Good average bench

The Adata XPG SX900 256GB averaged 22.9% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Adata XPG SX900 256GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 186MB/s
Avg. 4K Random Mixed IO Speed 35.8MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Adata XPG SX900 256GB is 34.6%. This is a relatively narrow range which indicates that the Adata XPG SX900 256GB performs reasonably consistently under varying real world conditions.


Avg. Sustained Write Speed 188MB/s
Avg. Sequential Write Speed 253MB/s

Average Bench

(Based on 5,673 samples)
Min Avg Max
302 Read 367 424
174 Write 253 293
220 Mixed 271 301
125 SusWrite 188 236
60.2% 269 MB/s
Min Avg Max
21 4K Read 28.6 35.2
38.5 4K Write 81.3 112
23.5 4K Mixed 35.8 45.1
132% 48.5 MB/s
Min Avg Max
158 DQ Read 243 290
97 DQ Write 217 263
80 DQ Mixed 186 255
151% 215 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
41GB free
Firmware: 5.0.7a
SusWrite @10s intervals: 238 243 243 236 225 218 MB/s
Read 385
Write 274
Mixed 267
SusWrite 234
65% 290 MB/s
4K Read 29.9
4K Write 77.8
4K Mixed 35.4
132% 47.7 MB/s
DQ Read 288
DQ Write 242
DQ Mixed 164
150% 231 MB/s
238GB free
Firmware: 5.0.7b
SusWrite @10s intervals: 219 164 125 232 224 209 MB/s
Read 418
Write 294
Mixed 294
SusWrite 196
67% 300 MB/s
4K Read 28.3
4K Write 86.1
4K Mixed 38.4
138% 50.9 MB/s
DQ Read 262
DQ Write 200
DQ Mixed 139
129% 200 MB/s
12GB free
Firmware: 5.6.0
SusWrite @10s intervals: 163 161 164 165 145 165 MB/s
Read 387
Write 169
Mixed 181
SusWrite 160
50% 224 MB/s
4K Read 30.4
4K Write 16.8
4K Mixed 23.3
85% 23.5 MB/s
DQ Read 156
DQ Write 64.2
DQ Mixed 77
66% 99 MB/s
5,673 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 47,017,445 SSDs tested.


MSRP ≈ $188 @ launch in Mar '12
AmazonUS $1643 years
Send price feedback
Typical XPG SX900 256GB Builds (Compare 7,584 builds) See popular component choices, score breakdowns and rankings.
Gaming 43%
Speed boat
Desktop 88%
Aircraft carrier
Workstation 37%
Jet ski

Motherboard: Asus PRIME H310M-K R2.0

EDIT WITH CUSTOM PC BUILDER Value: 61% - Good Total price: $565

Popular XPG SX900 256GB compatible motherboards:

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark.
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - SkillBench (space shooter) tests user input accuracy.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the current market leaders.
  • - Explore your best upgrade options with a virtual PC build.
  • - Compare your in-game FPS to other users with your hardware.
Solid State Drive Rankings (Price vs Performance) September 2021 SSD Rankings.

Welcome to our 2.5" and M.2 SSD comparison. We calculate effective speed for both SATA and NVMe drives based on real world performance then adjust by current prices per GB to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top SSDs. [SSDrivePro]


Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.


Controller: LSI SandForce SF2281VB1-SDC. Flash Memory: Intel Micron Synchronous 25nm MLC

Breaking through the limits...

Added 7 years ago.


4 years ago.

Not stable, numerous crashes (Win7x64Pro), failure to write crash dumps, etc. Customer support very poor as well.

Below average

7 years ago.

Review  tweakers.net/...

Image  tweakers.net/...
Jan '13 AS SSD Benchmark Scores

Jan '13 AS SSD Benchmark Scores

1058 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different SSDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

 Best User Rated

The Best.
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Intel Core i7-11700K $346Nvidia GTX 1660S (Super) $240Samsung 860 Evo 250GB $52
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3200 C16 2x8GB $78SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3000 C15 2x8GB $77SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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