Average Bench: 95.3% (265th of 1058)

Based on 5,970 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 4.7% 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 243MB/s
Avg. 4K Random Mixed IO Speed 39.1MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 47%. This is a relatively wide range which indicates that the Crucial BX300 240GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 360MB/s
Avg. Sequential Mixed IO Speed 369MB/s

Average Bench

(Based on 5,970 samples)
Min Avg Max
381 Read 478 515
186 Write 402 475
209 Mixed 369 444
200 SusWrite 360 446
90.3% 402 MB/s
Min Avg Max
18.5 4K Read 27.5 33.4
37.8 4K Write 80.1 121
24.6 4K Mixed 39.1 50.4
134% 48.9 MB/s
Min Avg Max
178 DQ Read 282 317
95.2 DQ Write 279 363
92.8 DQ Mixed 243 299
193% 268 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
161GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 425 422 430 432 431 429 MB/s
Read 515
Write 434
Mixed 367
SusWrite 428
98% 436 MB/s
4K Read 28.4
4K Write 115
4K Mixed 43.5
160% 62.2 MB/s
DQ Read 247
DQ Write 348
DQ Mixed 241
198% 279 MB/s
203GB free
Firmware: M2CR010
SusWrite @10s intervals: 454 439 442 442 444 444 MB/s
Read 505
Write 448
Mixed 440
SusWrite 444
103% 459 MB/s
4K Read 30
4K Write 80.2
4K Mixed 42.5
142% 50.9 MB/s
DQ Read 315
DQ Write 361
DQ Mixed 298
236% 325 MB/s
163GB free
Firmware: M2CR010
SusWrite @10s intervals: 444 442 439 437 437 438 MB/s
Read 506
Write 464
Mixed 437
SusWrite 439
104% 461 MB/s
4K Read 28.4
4K Write 73.6
4K Mixed 38
131% 46.7 MB/s
DQ Read 313
DQ Write 361
DQ Mixed 298
235% 324 MB/s
152GB free
Firmware: M2CR010
SusWrite @10s intervals: 321 403 431 432 434 432 MB/s
Read 451
Write 437
Mixed 424
SusWrite 409
97% 430 MB/s
4K Read 27.9
4K Write 63
4K Mixed 37.4
124% 42.8 MB/s
DQ Read 313
DQ Write 358
DQ Mixed 290
231% 320 MB/s
37GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 148 367 104 130 116 131 MB/s
Read 475
Write 420
Mixed 357
SusWrite 166
79% 354 MB/s
4K Read 19.4
4K Write 47
4K Mixed 27.5
90% 31.3 MB/s
DQ Read 240
DQ Write 353
DQ Mixed 241
198% 278 MB/s
5,970 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 47,294,892 SSDs tested.


MSRP ≈ $50 @ launch in Aug '17
AmazonUS $3012 months
EbayUS $12023 mins
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Typical BX300 240GB Builds (Compare 67,543 builds) See popular component choices, score breakdowns and rankings.
Gaming 48%
Desktop 81%
Aircraft carrier
Workstation 44%
Speed boat

Motherboard: Gigabyte B450M DS3H - $68

EDIT WITH CUSTOM PC BUILDER Value: 71% - Very good Total price: $602

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.
  • - SkillBench (space shooter) tests user input accuracy.
  • - 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.
Solid State Drive Rankings (Price vs Performance) September 2021 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 3 years ago.


3 years ago.

1058 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 i5-11600K $270Nvidia RTX 3060-Ti $400Crucial MX500 250GB $45
Intel Core i5-11400F $260Nvidia RTX 3070 $500Samsung 860 Evo 250GB $52
Intel Core i7-11700K $394Nvidia GTX 1660S (Super) $240Samsung 850 Evo 120GB $183
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3200 C16 2x8GB $74SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3000 C15 2x8GB $77SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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