Average Bench: 95.1% (209th of 1000)

Based on 3,315 user benchmarks.  Model: CT240BX300SSD1

Crucial’s BX300 SSD is a 3D MLC entry level SSD, with debut pricing in line with the Samsung's 850 Evo, the current market leader. The BX300 is one of the faster consumer SSDs available, with a 2% performance improvement over Crucial’s older MLC based MX200 and a 25% performance improvement over the TLC based MX300 which are both from Crucial’s more expensive MX product line. MLC NAND offers more consistent performance and has higher endurance than TLC NAND. Although Samsung’s 850 Evo (which is based on proprietary TLC V-NAND) has a 10% effective speed advantage over the BX300 the BX300 wins on write consistency. The 240GB BX300 has a three year warranty or 80 Terabytes Written (TBW) compared to five years or 75 (TBW) for the 250 GB 850 Evo. This makes for an interesting choice between the BX300 and the 850 Evo. Each model has an SLC cache which is proportional to its capacity, as a result the larger capacities offer better performance. The 120 GB BX300 has a 4 GB SLC cache, the 240 GB has 8 GB and the 480 GB has 16 GB. SLC caches improve burst write performance beyond the already respectable MLC write performance. Unfortunately, at least for now, the BX300 only comes in modest capacities, with the largest being 480 GB. For write consistency, thanks to its MLC NAND, the BX300 punches well above its price point. [Nov '17 SSDrivePro]


Excellent average bench

The Crucial BX300 240GB averaged just 4.9% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Crucial BX300 240GB near the top of the comparison list.


Avg. 4K-64Thread Mixed IO Speed 249MB/s
Avg. 4K Random Mixed IO Speed 39.6MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 51.1%. This is a relatively wide range which indicates that the Crucial BX300 240GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 355MB/s
Avg. Sequential Mixed IO Speed 364MB/s

Average Bench

(Based on 3,315 samples)
Min Avg Max
357 Read 470 514
213 Write 410 474
209 Mixed 364 441
207 SusWrite 355 442
89.9% 400 MB/s
Min Avg Max
16.2 4K Read 27.7 34
35.4 4K Write 81 126
23.1 4K Mixed 39.6 51.7
136% 49.4 MB/s
Min Avg Max
104 DQ Read 284 318
97.6 DQ Write 276 360
50.5 DQ Mixed 249 297
196% 270 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
31GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 304 423 321 91 123 125 MB/s
Read 508
Write 470
Mixed 228
SusWrite 231
80% 359 MB/s
4K Read 31.4
4K Write 68
4K Mixed 41.2
136% 46.9 MB/s
DQ Read 316
DQ Write 213
DQ Mixed 186
160% 239 MB/s
25GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 366 361 219 191 123 135 MB/s
Read 486
Write 403
Mixed 210
SusWrite 233
74% 333 MB/s
4K Read 29.1
4K Write 58.4
4K Mixed 38.5
124% 42 MB/s
DQ Read 310
DQ Write 138
DQ Mixed 277
191% 242 MB/s
68GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 274 348 376 372 373 372 MB/s
Read 362
Write 343
Mixed 328
SusWrite 352
78% 347 MB/s
4K Read 25.9
4K Write 75.6
4K Mixed 36.2
126% 45.9 MB/s
DQ Read 32.3
DQ Write 118
DQ Mixed 47.5
44% 65.8 MB/s
60GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 416 277 312 422 158 421 MB/s
Read 456
Write 108
Mixed 338
SusWrite 334
69% 309 MB/s
4K Read 19.9
4K Write 36.8
4K Mixed 26.3
83% 27.7 MB/s
DQ Read 301
DQ Write 295
DQ Mixed 293
222% 297 MB/s
83GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 258 238 238 237 236 238 MB/s
Read 287
Write 222
Mixed 239
SusWrite 241
56% 247 MB/s
4K Read 14.2
4K Write 51
4K Mixed 22.3
77% 29.2 MB/s
DQ Read 23
DQ Write 101
DQ Mixed 35.3
35% 53 MB/s
3,315 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 14,373,882 SSDs tested.


Approx. $50 @ launch in Aug '17
AmazonUS $303 days
EbayUS $13713 mins
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Typical BX300 240GB Builds (Compare 27,346 builds) See popular component choices, score breakdowns and rankings.
Gaming 68%
Battle cruiser
Desktop 74%
Workstation 68%
Battle cruiser

Motherboard: Asus PRIME B350-PLUS - $79

EDIT WITH CUSTOM PC BUILDER Value: 123% - Outstanding Total price: $515

Popular BX300 240GB 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.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
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  • - Explore your best upgrade options with a virtual PC build.
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  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) May 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: Silicon Motion SM2258. Flash Memory: Micron 3D MLC

You dont need a new computer, just the Crucial BX300...

Added 18 months ago.


17 months ago.

1000 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

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AMD Ryzen 5 2600 $145Nvidia GTX 1060-6GB $208Samsung 850 Evo 500GB $99
AMD Ryzen 5 1600 $108Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $163
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WD Blue 1TB (2012) $40G.SKILL Trident Z DDR4 3200 C14 4x16GB $651SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $73Corsair Vengeance LPX DDR4 3200 C16 2x8GB $85SanDisk Ultra Fit 32GB $12
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