Average Bench: 95.3% (244th of 1037)

Based on 4,644 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 4.6% 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 247MB/s
Avg. 4K Random Mixed IO Speed 39.8MB/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 357MB/s
Avg. Sequential Mixed IO Speed 365MB/s

Average Bench

(Based on 4,644 samples)
Min Avg Max
371 Read 475 515
229 Write 413 474
205 Mixed 365 444
195 SusWrite 357 446
90.4% 402 MB/s
Min Avg Max
18.7 4K Read 28.1 33.9
40.8 4K Write 80.3 123
25.3 4K Mixed 39.8 51.6
136% 49.4 MB/s
Min Avg Max
172 DQ Read 283 317
110 DQ Write 276 362
80.1 DQ Mixed 247 298
195% 269 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
47GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 273 432 444 451 195 174 MB/s
Read 514
Write 430
Mixed 430
SusWrite 328
96% 425 MB/s
4K Read 34.1
4K Write 124
4K Mixed 51.6
184% 70 MB/s
DQ Read 316
DQ Write 346
DQ Mixed 293
231% 318 MB/s
145GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 433 434 433 439 439 439 MB/s
Read 478
Write 431
Mixed 411
SusWrite 436
99% 439 MB/s
4K Read 23
4K Write 58.3
4K Mixed 35
110% 38.8 MB/s
DQ Read 316
DQ Write 350
DQ Mixed 295
233% 320 MB/s
41GB free (System drive)
Firmware: 010
SusWrite @10s intervals: 289 349 291 405 407 177 MB/s
Read 444
Write 406
Mixed 400
SusWrite 320
88% 392 MB/s
4K Read 31.2
4K Write 69.8
4K Mixed 40.4
136% 47.1 MB/s
DQ Read 314
DQ Write 144
DQ Mixed 178
146% 212 MB/s
74GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 364 374 389 392 400 272 MB/s
Read 451
Write 389
Mixed 370
SusWrite 365
89% 394 MB/s
4K Read 19
4K Write 42.4
4K Mixed 25.4
84% 28.9 MB/s
DQ Read 235
DQ Write 231
DQ Mixed 202
160% 223 MB/s
15GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 205 104 180 183 198 176 MB/s
Read 465
Write 85.8
Mixed 95.6
SusWrite 174
45% 205 MB/s
4K Read 19.3
4K Write 49.2
4K Mixed 26.5
89% 31.7 MB/s
DQ Read 244
DQ Write 150
DQ Mixed 160
129% 185 MB/s
4,644 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 31,747,829 SSDs tested.


Approx. $50 @ launch in Aug '17
AmazonUS $306 mins
EbayUS $12012 mins
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Typical BX300 240GB Builds (Compare 32,450 builds) See popular component choices, score breakdowns and rankings.
Gaming 50%
Desktop 82%
Aircraft carrier
Workstation 46%

Motherboard: Gigabyte B450M DS3H - $73

EDIT WITH CUSTOM PC BUILDER Value: 84% - Excellent Total price: $487

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.

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) September 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: Silicon Motion SM2258. Flash Memory: Micron 3D MLC

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

Added 2 years ago.


2 years ago.

1037 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 $195Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $45
Intel Core i5-9400F $140Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $290Nvidia RTX 2070S (Super) $505Samsung 860 Evo 250GB $42
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $69SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $65SanDisk Extreme 32GB $30
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Extreme 16GB $28
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