Average Bench: 94.9% (167th of 959)

Based on 1,736 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 5.1% 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 249MB/s
Avg. 4K Random Mixed IO Speed 39.5MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 49.9%. This is a relatively wide range which indicates that the Crucial BX300 240GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 353MB/s
Avg. Sequential Mixed IO Speed 369MB/s

Average Bench

(Based on 1,736 samples)
Min Avg Max
365 Read 471 514
190 Write 404 474
209 Mixed 369 442
189 SusWrite 353 446
89.7% 399 MB/s
Min Avg Max
16.5 4K Read 27.8 34
35.4 4K Write 81.5 126
22.1 4K Mixed 39.5 52.1
136% 49.6 MB/s
Min Avg Max
154 DQ Read 282 318
95.4 DQ Write 284 359
46.8 DQ Mixed 249 297
196% 272 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
186GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 398 447 443 458 449 451 MB/s
Read 496
Write 200
Mixed 324
SusWrite 441
82% 365 MB/s
4K Read 31.8
4K Write 110
4K Mixed 49
169% 63.5 MB/s
DQ Read 316
DQ Write 345
DQ Mixed 294
231% 318 MB/s
104GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 465 456 459 460 461 464 MB/s
Read 509
Write 468
Mixed 445
SusWrite 461
106% 471 MB/s
4K Read 31.5
4K Write 92
4K Mixed 45.9
155% 56.5 MB/s
DQ Read 226
DQ Write 258
DQ Mixed 244
183% 243 MB/s
139GB free
Firmware: M2CR010
SusWrite @10s intervals: 411 304 335 323 247 258 MB/s
Read 451
Write 414
Mixed 395
SusWrite 313
88% 393 MB/s
4K Read 20.5
4K Write 101
4K Mixed 35.1
130% 52.3 MB/s
DQ Read 315
DQ Write 322
DQ Mixed 282
222% 306 MB/s
51GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 255 256 294 240 130 135 MB/s
Read 511
Write 281
Mixed 229
SusWrite 218
69% 310 MB/s
4K Read 33.2
4K Write 76.3
4K Mixed 40.9
143% 50.1 MB/s
DQ Read 318
DQ Write 154
DQ Mixed 180
149% 217 MB/s
1,736 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 9,145,409 SSDs tested.


Approx. $50 @ launch in Aug '17
EbayUS $6024 mins
AmazonUS $6216 mins
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Typical BX300 240GB Builds (Compare 18,678 builds) See popular component choices, score breakdowns and rankings.
Gaming 68%
Battle cruiser
Desktop 73%
Workstation 67%
Battle cruiser

Motherboard: Asus PRIME B350-PLUS - $85

EDIT WITH CUSTOM PC BUILDER Value: 97% - Outstanding Total price: $696

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) October 2018 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 11 months ago.


10 months ago.

959 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 $380Nvidia GTX 1070 $323Samsung 850 Evo 250GB $100
AMD Ryzen 5 1600 $155Nvidia GTX 1060-6GB $249Samsung 850 Evo 500GB $98
Intel Core i7-7700K $350AMD RX 480 $280Samsung 850 Pro 256GB $160
Seagate Barracuda 1TB (2016) $40G.SKILL Trident Z DDR4 3200 C14 4x16GB $869SanDisk Extreme 64GB $42
Seagate Barracuda 3TB (2016) $80Corsair Vengeance LPX DDR4 3000 C15 2x8GB $147SanDisk Extreme 32GB $30
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $157SanDisk Ultra Fit 32GB $12
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