Average Bench: 91.7% (253rd of 1011)

more Based on 4,674 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 8.2% 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 203MB/s
Avg. 4K Random Mixed IO Speed 38.8MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial M550 256GB is 48.9%. This is a relatively wide range which indicates that the Crucial M550 256GB performs inconsistently under varying real world conditions.


Avg. Sequential Mixed IO Speed 301MB/s
Avg. Sustained Write Speed 308MB/s

Average Bench

(Based on 4,674 samples)
Min Avg Max
328 Read 423 465
312 Write 420 472
241 Mixed 301 333
131 SusWrite 308 462
81.6% 363 MB/s
Min Avg Max
19.9 4K Read 27.3 32
48.2 4K Write 89.1 123
25.5 4K Mixed 38.8 47.1
138% 51.7 MB/s
Min Avg Max
31.2 DQ Read 305 387
89.4 DQ Write 291 361
44 DQ Mixed 203 240
178% 266 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
95GB free (System drive)
Firmware: MU02
SusWrite @10s intervals: 309 271 267 259 260 253 MB/s
Read 448
Write 442
Mixed 292
SusWrite 270
82% 363 MB/s
4K Read 29
4K Write 87.1
4K Mixed 40.5
142% 52.2 MB/s
DQ Read 382
DQ Write 322
DQ Mixed 230
206% 311 MB/s
51GB free (System drive)
Firmware: MU02
SusWrite @10s intervals: 364 162 151 149 144 140 MB/s
Read 457
Write 436
Mixed 308
SusWrite 185
78% 346 MB/s
4K Read 29.6
4K Write 91.6
4K Mixed 42.1
147% 54.4 MB/s
DQ Read 220
DQ Write 186
DQ Mixed 163
133% 190 MB/s
43GB free (System drive)
Firmware: MU01
SusWrite @10s intervals: 340 207 117 138 121 133 MB/s
Read 424
Write 390
Mixed 302
SusWrite 176
72% 323 MB/s
4K Read 22.3
4K Write 63
4K Mixed 32.2
108% 39.2 MB/s
DQ Read 375
DQ Write 322
DQ Mixed 234
207% 311 MB/s
55GB free (System drive)
Firmware: MU02
SusWrite @10s intervals: 111 111 104 114 84 82 MB/s
Read 283
Write 344
Mixed 256
SusWrite 101
55% 246 MB/s
4K Read 22.9
4K Write 57.1
4K Mixed 31.7
106% 37.2 MB/s
DQ Read 29.6
DQ Write 112
DQ Mixed 41.4
40% 61.1 MB/s
4,674 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 18,563,680 SSDs tested.

Typical M550 256GB Builds (Compare 8,789 builds) See popular component choices, score breakdowns and rankings.
Gaming 50%
Desktop 73%
Workstation 51%

Motherboard: Asus MAXIMUS VII RANGER - $283

EDIT WITH CUSTOM PC BUILDER Value: 42% - Average Total price: $1,182

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) October 2019 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 5 years ago.


2 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 ???


2 years ago.

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


3 years ago.

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


5 years ago.

1011 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 i5-9400F $145Nvidia GTX 1660 $210Samsung 850 Evo 250GB $57
Intel Core i5-9600K $240Nvidia GTX 1660-Ti $270Samsung 850 Evo 500GB $107
Intel Core i7-9700K $350Nvidia RTX 2060 $344Samsung 850 Pro 256GB $160
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $76SanDisk Extreme 64GB $88
Seagate Barracuda 3TB (2016) $78G.SKILL Trident Z DDR4 3200 C14 4x16GB $612SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $83SanDisk Ultra Fit 32GB $14
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