Average Bench: 94.7% (218th of 1003)

Based on 3,598 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 5.3% 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 251MB/s
Avg. 4K Random Mixed IO Speed 39.5MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 50.1%. This is a relatively wide range which indicates that the Crucial BX300 240GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 353MB/s
Avg. Sequential Mixed IO Speed 364MB/s

Average Bench

(Based on 3,598 samples)
Min Avg Max
361 Read 470 514
193 Write 408 472
209 Mixed 364 442
201 SusWrite 353 446
89.6% 399 MB/s
Min Avg Max
17.1 4K Read 27.7 33.9
37.4 4K Write 79.2 125
23.8 4K Mixed 39.5 51.7
134% 48.8 MB/s
Min Avg Max
91.8 DQ Read 285 318
106 DQ Write 278 362
65.2 DQ Mixed 251 298
197% 271 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
182GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 469 436 439 441 439 439 MB/s
Read 518
Write 475
Mixed 446
SusWrite 444
106% 471 MB/s
4K Read 34.3
4K Write 138
4K Mixed 54.5
195% 75.6 MB/s
DQ Read 315
DQ Write 344
DQ Mixed 294
231% 318 MB/s
127GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 354 419 424 427 429 429 MB/s
Read 503
Write 468
Mixed 428
SusWrite 414
102% 453 MB/s
4K Read 29.7
4K Write 83.4
4K Mixed 42.3
143% 51.8 MB/s
DQ Read 314
DQ Write 355
DQ Mixed 295
233% 322 MB/s
100GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 397 398 410 416 396 404 MB/s
Read 468
Write 415
Mixed 405
SusWrite 403
95% 423 MB/s
4K Read 27.1
4K Write 66.1
4K Mixed 37.5
124% 43.6 MB/s
DQ Read 313
DQ Write 328
DQ Mixed 289
226% 310 MB/s
65GB free
Firmware: M2CR010
SusWrite @10s intervals: 347 426 424 422 427 425 MB/s
Read 492
Write 453
Mixed 231
SusWrite 412
89% 397 MB/s
4K Read 28.4
4K Write 57.4
4K Mixed 36.1
120% 40.6 MB/s
DQ Read 312
DQ Write 214
DQ Mixed 294
211% 273 MB/s
19GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 217 266 250 320 74 124 MB/s
Read 508
Write 310
Mixed 225
SusWrite 208
70% 313 MB/s
4K Read 32.2
4K Write 77.6
4K Mixed 43.2
145% 51 MB/s
DQ Read 316
DQ Write 316
DQ Mixed 294
227% 308 MB/s
3,598 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 15,833,395 SSDs tested.


Approx. $50 @ launch in Aug '17
AmazonUS $306 days
EbayUS $1202 mins
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Typical BX300 240GB Builds (Compare 29,509 builds) See popular component choices, score breakdowns and rankings.
Gaming 67%
Battle cruiser
Desktop 73%
Workstation 67%
Battle cruiser

Motherboard: Asus PRIME B350-PLUS - $120

EDIT WITH CUSTOM PC BUILDER Value: 121% - Outstanding Total price: $573

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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  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) July 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 20 months ago.


19 months ago.

1003 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 $350Nvidia GTX 1070 $400Samsung 850 Evo 250GB $104
AMD Ryzen 5 2600 $127Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $103
AMD Ryzen 7 2700X $248Nvidia GTX 1080-Ti $709Samsung 850 Pro 256GB $97
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $68SanDisk Extreme 64GB $128
Seagate Barracuda 3TB (2016) $70G.SKILL Trident Z DDR4 3200 C14 4x16GB $606SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $78SanDisk Ultra Fit 32GB $12
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