Average Bench: 95.5% (221st of 1011)

Based on 3,399 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 4.4% 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 252MB/s
Avg. 4K Random Mixed IO Speed 40.1MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 48.9%. 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 371MB/s

Average Bench

(Based on 3,399 samples)
Min Avg Max
368 Read 473 515
209 Write 414 473
206 Mixed 371 444
194 SusWrite 355 447
90.6% 403 MB/s
Min Avg Max
19.8 4K Read 28.1 34.1
41.6 4K Write 80.7 126
26.5 4K Mixed 40.1 51.7
137% 49.6 MB/s
Min Avg Max
141 DQ Read 283 317
108 DQ Write 279 361
116 DQ Mixed 252 297
197% 272 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
150GB free
Firmware: M2CR010
SusWrite @10s intervals: 472 450 451 455 453 456 MB/s
Read 516
Write 471
Mixed 445
SusWrite 456
106% 472 MB/s
4K Read 32.1
4K Write 105
4K Mixed 45.8
163% 61.1 MB/s
DQ Read 312
DQ Write 361
DQ Mixed 298
235% 324 MB/s
34GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 337 453 180 130 119 131 MB/s
Read 508
Write 460
Mixed 227
SusWrite 225
79% 355 MB/s
4K Read 30
4K Write 58.1
4K Mixed 39.2
126% 42.4 MB/s
DQ Read 312
DQ Write 190
DQ Mixed 292
207% 265 MB/s
72GB free
Firmware: M2CR010
SusWrite @10s intervals: 297 298 403 413 406 405 MB/s
Read 366
Write 295
Mixed 322
SusWrite 370
76% 338 MB/s
4K Read 20.2
4K Write 43.3
4K Mixed 24
84% 29.2 MB/s
DQ Read 243
DQ Write 356
DQ Mixed 244
200% 281 MB/s
41GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 305 388 181 178 127 120 MB/s
Read 454
Write 420
Mixed 216
SusWrite 216
73% 327 MB/s
4K Read 24.8
4K Write 50.7
4K Mixed 33.8
108% 36.4 MB/s
DQ Read 311
DQ Write 159
DQ Mixed 292
202% 254 MB/s
3,399 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 17,666,076 SSDs tested.


Approx. $50 @ launch in Aug '17
AmazonUS $301 month
EbayUS $12020 mins
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Typical BX300 240GB Builds (Compare 31,751 builds) See popular component choices, score breakdowns and rankings.
Gaming 54%
Desktop 66%
Battle cruiser
Workstation 56%

Motherboard: Asus PRIME B350-PLUS - $140

EDIT WITH CUSTOM PC BUILDER Value: 69% - Good Total price: $580

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 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 22 months ago.


22 months 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 $140Nvidia GTX 1660 $220Samsung 850 Evo 250GB $70
Intel Core i5-9600K $225Nvidia GTX 1660-Ti $278Samsung 850 Evo 500GB $105
AMD Ryzen 5 3600 $195Nvidia RTX 2060S (Super) $429Samsung 850 Pro 256GB $203
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3000 C15 2x8GB $70SanDisk Extreme 64GB $88
WD Blue 1TB (2012) $34G.SKILL Trident Z DDR4 3200 C14 4x16GB $606SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $64Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73SanDisk Extreme 16GB $24
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