Average Bench: 89.6% (295th of 1026)

more Based on 5,856 user benchmarks.  Models: Crucial_CT256M550SSD1, Micron_M550_2.5", Crucial_ CT256M550SSD3, Crucial_CT256M55, Micron_M Micron_M550_2.5", Crucial_ CT256M550SSD4, Crucial_ Crucial_CT256M55, Crucial_ CT256M550SSD1

The 256GB Crucial M550 is a welcome improvement over the 240GB M500. The new Marvel 88SS9189 controller has addressed our primary concern with the M500 which was poor sequential write speed. With sequential read/write speeds of 510/478 MB/s the M550 has a healthy core performance profile. Comparing the M550 and M500 shows that the new M550 leads on nearly every single performance metric. Unfortunately the M550 is priced significantly higher than the M500 but prices will likely drop as retailers build up stocks of the new M550. A key comparable for the M550 is the similarly priced market leading Samsung Evo. Comparing the Evo and M550 shows that the Evo is around 11% slower in terms of effective speed[Mar '14 SSDrivePro]


Very good average bench

The Crucial M550 256GB averaged just 10.4% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Crucial M550 256GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 208MB/s
Avg. 4K Random Mixed IO Speed 37.5MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Crucial M550 256GB is 54%. This is a relatively wide range which indicates that the Crucial M550 256GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 297MB/s
Avg. Sequential Mixed IO Speed 298MB/s

Average Bench

(Based on 5,856 samples)
Min Avg Max
308 Read 418 463
311 Write 417 469
234 Mixed 298 330
126 SusWrite 297 458
80.4% 358 MB/s
Min Avg Max
18.3 4K Read 26.5 31.8
43 4K Write 84.6 117
24.3 4K Mixed 37.5 46.3
133% 49.5 MB/s
Min Avg Max
106 DQ Read 316 386
97.8 DQ Write 295 360
86.3 DQ Mixed 208 240
183% 273 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
84GB free
Firmware: MU01
SusWrite @10s intervals: 459 436 391 318 281 278 MB/s
Read 457
Write 473
Mixed 322
SusWrite 360
91% 403 MB/s
4K Read 31.5
4K Write 114
4K Mixed 46
167% 63.7 MB/s
DQ Read 389
DQ Write 359
DQ Mixed 242
218% 330 MB/s
45GB free
Firmware: MU01
SusWrite @10s intervals: 456 312 289 272 267 255 MB/s
Read 447
Write 467
Mixed 328
SusWrite 308
87% 388 MB/s
4K Read 29.5
4K Write 98.4
4K Mixed 42
151% 56.6 MB/s
DQ Read 380
DQ Write 335
DQ Mixed 231
208% 315 MB/s
238GB free
Firmware: MU01
SusWrite @10s intervals: 420 424 441 446 439 445 MB/s
Read 434
Write 450
Mixed 324
SusWrite 436
93% 411 MB/s
4K Read 25.6
4K Write 65.2
4K Mixed 34.1
117% 41.6 MB/s
DQ Read 347
DQ Write 332
DQ Mixed 235
205% 305 MB/s
139GB free
Firmware: MU02
SusWrite @10s intervals: 424 425 426 422 423 420 MB/s
Read 452
Write 423
Mixed 309
SusWrite 424
90% 402 MB/s
4K Read 26.6
4K Write 63.5
4K Mixed 28
110% 39.4 MB/s
DQ Read 216
DQ Write 181
DQ Mixed 163
132% 187 MB/s
5,856 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 28,548,429 SSDs tested.

Typical M550 256GB Builds (Compare 11,787 builds) See popular component choices, score breakdowns and rankings.
Gaming 53%
Desktop 78%
Workstation 60%

Motherboard: Asus MAXIMUS VII RANGER - $283

EDIT WITH CUSTOM PC BUILDER Value: 46% - Average Total price: $1,178

Popular M550 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.
  • - 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.
  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) July 2020 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: Marvell 88SS9189. Flash Memory: Micron Synchronous 20nm MLC

Do more, faster longer...

Added 6 years ago.


3 years ago.

My rating was for the M550 512Gb SSD because Crucial Website says (AFTER I ordered one from Amazon) that it is not compatible with an ASUS Sabertooth Z87 motherboard. I mean. Why in F**K would a very recent SSD not be compatible with a very recent high-end motherboard? What nutter markets SSD`s which are (otherwise) secretly not going to work on modern PC`s ???


3 years ago.

I have one M550 / 256GB, one M500 / 240GB and old M4 /128GB. M550 is very good, very fast SSD.


6 years ago.


4 years ago.

Great drive. I have m550 512gb and is crazy fast

1026 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.
Intel Core i5-9600K $190Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $47
Intel Core i5-9400F $150Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $368Nvidia RTX 2070S (Super) $510Samsung 850 Pro 512GB $249
Seagate Barracuda 1TB (2016) $42Corsair Vengeance LPX DDR4 3200 C16 2x8GB $67SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $75SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $681SanDisk Extreme 16GB $24
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