Average Bench: 91.1% (177th of 956)

more Based on 4,079 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]


Excellent average bench

The Crucial M550 256GB averaged just 8.9% 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 Random Write Speed 84.3MB/s
Avg. 4K-64Thread Mixed IO Speed 83.8MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial M550 256GB is 45%. This is a relatively wide range which indicates that the Crucial M550 256GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 283MB/s
Avg. 4K-64Thread Read Speed 211MB/s

Average Bench

(Based on 4,079 samples)
Min Avg Max
336 Read 479 524
337 Write 443 482
242 Mixed 415 491
93.1 SusWrite 283 445
90.9% 405 MB/s
Min Avg Max
18.5 4K Read 26.2 31.7
41.6 4K Write 84.3 117
15.8 4K Mixed 29.5 43.9
122% 46.7 MB/s
Min Avg Max
22.5 DQ Read 211 381
65.7 DQ Write 221 344
14.8 DQ Mixed 83.8 237
99.5% 172 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
107GB free (System drive)
Firmware: MU02
SusWrite @10s intervals: 325 366 327 313 308 298 MB/s
Read 418
Write 443
Mixed 302
SusWrite 323
84% 371 MB/s
4K Read 28.5
4K Write 109
4K Mixed 40.5
153% 59.2 MB/s
DQ Read 383
DQ Write 339
DQ Mixed 241
214% 321 MB/s
97GB free (System drive)
Firmware: MU01
SusWrite @10s intervals: 297 155 128 101 108 95 MB/s
Read 457
Write 463
Mixed 329
SusWrite 147
78% 349 MB/s
4K Read 31.1
4K Write 118
4K Mixed 46.6
169% 65.2 MB/s
DQ Read 326
DQ Write 322
DQ Mixed 215
191% 288 MB/s
59GB free (System drive)
Firmware: MU02
SusWrite @10s intervals: 435 108 119 115 104 116 MB/s
Read 426
Write 453
Mixed 330
SusWrite 166
77% 344 MB/s
4K Read 26.6
4K Write 69.8
4K Mixed 36.3
124% 44.2 MB/s
DQ Read 131
DQ Write 127
DQ Mixed 130
97% 129 MB/s
46GB free (System drive)
Firmware: MU01
SusWrite @10s intervals: 203 107 104 123 105 100 MB/s
Read 350
Write 189
Mixed 231
SusWrite 124
50% 223 MB/s
4K Read 11.8
4K Write 42
4K Mixed 22.5
69% 25.4 MB/s
DQ Read 303
DQ Write 152
DQ Mixed 167
140% 207 MB/s
4,079 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 8,001,532 SSDs tested.

Typical M550 256GB Builds (Compare 5,562 builds) See popular component choices, score breakdowns and rankings.
Gaming 63%
Desktop 77%
Workstation 57%

Motherboard: Asus MAXIMUS VII RANGER - $283

EDIT WITH CUSTOM PC BUILDER Value: 70% - Very good Total price: $1,140

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.

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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.
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Solid State Drive Rankings (Price vs Performance) August 2018 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 4 years ago.


20 months ago.

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


17 months 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 ???


4 years ago.


2 years ago.

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

956 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 i7-8700K $330Nvidia GTX 1070 $370Samsung 850 Evo 250GB $95
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $240Samsung 850 Evo 500GB $120
Intel Core i5-8600K $240AMD RX 480 $280Samsung 850 Pro 256GB $163
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $155SanDisk Extreme 64GB $80
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $901SanDisk Extreme 32GB $30
WD Blue 1TB (2012) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $175SanDisk Ultra Fit 32GB $12
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