Average Bench: 96.4% (180th of 980)

Based on 2,001 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 3.6% 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 253MB/s
Avg. 4K Random Mixed IO Speed 40.7MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 45.4%. This is a relatively wide range which indicates that the Crucial BX300 240GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 352MB/s
Avg. Sequential Mixed IO Speed 367MB/s

Average Bench

(Based on 2,001 samples)
Min Avg Max
357 Read 470 514
196 Write 410 470
205 Mixed 367 440
194 SusWrite 352 444
89.8% 400 MB/s
Min Avg Max
19.9 4K Read 28.1 34.1
45.6 4K Write 84.4 126
26.9 4K Mixed 40.7 52
139% 51.1 MB/s
Min Avg Max
157 DQ Read 287 318
113 DQ Write 286 361
49.3 DQ Mixed 253 298
199% 275 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
134GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 452 400 431 430 434 437 MB/s
Read 513
Write 422
Mixed 408
SusWrite 431
100% 444 MB/s
4K Read 31.8
4K Write 99
4K Mixed 46.1
160% 59 MB/s
DQ Read 316
DQ Write 336
DQ Mixed 289
228% 314 MB/s
94GB free
Firmware: M2CR010
SusWrite @10s intervals: 393 297 289 305 407 407 MB/s
Read 500
Write 455
Mixed 430
SusWrite 350
97% 433 MB/s
4K Read 31.3
4K Write 107
4K Mixed 47.3
165% 61.9 MB/s
DQ Read 315
DQ Write 331
DQ Mixed 283
224% 310 MB/s
34GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 318 334 350 239 311 91 MB/s
Read 513
Write 457
Mixed 431
SusWrite 274
94% 419 MB/s
4K Read 31.4
4K Write 82.4
4K Mixed 44.4
148% 52.7 MB/s
DQ Read 316
DQ Write 359
DQ Mixed 297
235% 324 MB/s
171GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 417 433 434 425 426 426 MB/s
Read 460
Write 426
Mixed 360
SusWrite 427
94% 418 MB/s
4K Read 18.9
4K Write 57.3
4K Mixed 28.1
95% 34.8 MB/s
DQ Read 242
DQ Write 353
DQ Mixed 241
198% 279 MB/s
2,001 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 11,408,650 SSDs tested.


Approx. $50 @ launch in Aug '17
AmazonUS $394 days
EbayUS $8714 mins
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Typical BX300 240GB Builds (Compare 22,768 builds) See popular component choices, score breakdowns and rankings.
Gaming 68%
Battle cruiser
Desktop 74%
Workstation 68%
Battle cruiser

Motherboard: Asus PRIME B350-PLUS - $85

EDIT WITH CUSTOM PC BUILDER Value: 105% - Outstanding Total price: $648

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) January 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 14 months ago.


13 months ago.

980 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 $360Nvidia GTX 1070 $350Samsung 850 Evo 250GB $70
AMD Ryzen 5 1600 $159Nvidia GTX 1060-6GB $250Samsung 850 Evo 500GB $89
Intel Core i5-8600K $260Nvidia GTX 1080-Ti $700Samsung 850 Pro 256GB $163
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $115SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $780SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $125SanDisk Ultra Fit 32GB $12
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