Average Bench: 94.9% (235th of 1026)

Based on 4,547 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 5.0% 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 39.1MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 47.3%. This is a relatively wide range which indicates that the Crucial BX300 240GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 354MB/s
Avg. Sequential Mixed IO Speed 366MB/s

Average Bench

(Based on 4,547 samples)
Min Avg Max
372 Read 474 514
193 Write 409 472
205 Mixed 366 442
197 SusWrite 354 444
90% 401 MB/s
Min Avg Max
19 4K Read 27.9 33.7
37.5 4K Write 79.7 122
22.8 4K Mixed 39.1 50.9
134% 48.9 MB/s
Min Avg Max
219 DQ Read 290 317
112 DQ Write 281 362
122 DQ Mixed 251 298
198% 274 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
178GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 456 449 452 450 455 459 MB/s
Read 482
Write 424
Mixed 424
SusWrite 453
100% 446 MB/s
4K Read 32.6
4K Write 118
4K Mixed 47.2
172% 65.9 MB/s
DQ Read 312
DQ Write 338
DQ Mixed 292
229% 314 MB/s
147GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 424 431 436 434 434 100 MB/s
Read 510
Write 432
Mixed 372
SusWrite 376
95% 422 MB/s
4K Read 26.6
4K Write 88.1
4K Mixed 38.3
136% 51 MB/s
DQ Read 244
DQ Write 358
DQ Mixed 244
200% 282 MB/s
96GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 247 298 312 343 348 334 MB/s
Read 374
Write 360
Mixed 314
SusWrite 314
77% 340 MB/s
4K Read 16.8
4K Write 47.4
4K Mixed 21.6
78% 28.6 MB/s
DQ Read 238
DQ Write 230
DQ Mixed 191
155% 219 MB/s
25GB free
Firmware: 010
SusWrite @10s intervals: 263 356 181 191 121 135 MB/s
Read 342
Write 333
Mixed 328
SusWrite 208
68% 303 MB/s
4K Read 18.9
4K Write 36.8
4K Mixed 24.8
80% 26.8 MB/s
DQ Read 28.2
DQ Write 64.6
DQ Mixed 38.3
32% 43.7 MB/s
4,547 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 26,870,236 SSDs tested.


Approx. $50 @ launch in Aug '17
AmazonUS $3019 hrs
EbayUS $12022 mins
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Typical BX300 240GB Builds (Compare 40,839 builds) See popular component choices, score breakdowns and rankings.
Gaming 55%
Desktop 68%
Battle cruiser
Workstation 60%

Motherboard: Asus PRIME B350-PLUS - $100

EDIT WITH CUSTOM PC BUILDER Value: 67% - Good Total price: $623

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) June 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.

1026 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 $165Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $49
Intel Core i5-9600K $199Nvidia GTX 1650S (Super) $160Samsung 850 Evo 120GB $78
Intel Core i7-9700K $370Nvidia RTX 2070S (Super) $500Samsung 850 Pro 512GB $240
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $74SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $75SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $681SanDisk Ultra Fit 32GB $16
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