Average Bench: 94.9% (227th of 1011)

Based on 3,868 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 247MB/s
Avg. 4K Random Mixed IO Speed 39.9MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Crucial BX300 240GB is 47.4%. This is a relatively wide range which indicates that the Crucial BX300 240GB performs inconsistently under varying real world conditions.


Avg. Sustained Write Speed 349MB/s
Avg. Sequential Mixed IO Speed 366MB/s

Average Bench

(Based on 3,868 samples)
Min Avg Max
377 Read 473 514
193 Write 408 474
208 Mixed 366 443
191 SusWrite 349 447
89.6% 399 MB/s
Min Avg Max
19.1 4K Read 27.9 33.7
43.1 4K Write 81.2 124
25.6 4K Mixed 39.9 51.1
136% 49.6 MB/s
Min Avg Max
33.6 DQ Read 280 317
97.1 DQ Write 274 362
48.8 DQ Mixed 247 298
194% 267 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
119GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 455 414 444 447 450 444 MB/s
Read 514
Write 461
Mixed 425
SusWrite 442
104% 461 MB/s
4K Read 34.1
4K Write 122
4K Mixed 51.5
182% 69.3 MB/s
DQ Read 315
DQ Write 339
DQ Mixed 292
230% 315 MB/s
86GB free
Firmware: M2CR010
SusWrite @10s intervals: 471 468 446 449 450 450 MB/s
Read 518
Write 466
Mixed 446
SusWrite 456
106% 471 MB/s
4K Read 32.7
4K Write 110
4K Mixed 48.7
170% 63.6 MB/s
DQ Read 315
DQ Write 362
DQ Mixed 298
236% 325 MB/s
55GB free (System drive)
Firmware: M2CR010
SusWrite @10s intervals: 362 278 232 181 197 179 MB/s
Read 517
Write 480
Mixed 449
SusWrite 238
94% 421 MB/s
4K Read 32.2
4K Write 113
4K Mixed 49.6
172% 65 MB/s
DQ Read 315
DQ Write 363
DQ Mixed 298
236% 325 MB/s
217GB free
Firmware: M2CR010
SusWrite @10s intervals: 245 195 195 222 245 249 MB/s
Read 116
Write 429
Mixed 230
SusWrite 225
57% 250 MB/s
4K Read 30.4
4K Write 85.7
4K Mixed 43.6
147% 53.2 MB/s
DQ Read 186
DQ Write 183
DQ Mixed 167
130% 178 MB/s
3,868 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 19,849,350 SSDs tested.


Approx. $50 @ launch in Aug '17
AmazonUS $304 months
EbayUS $1208 mins
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Typical BX300 240GB Builds (Compare 34,193 builds) See popular component choices, score breakdowns and rankings.
Gaming 55%
Desktop 65%
Battle cruiser
Workstation 56%

Motherboard: Asus PRIME B350-PLUS - $85

EDIT WITH CUSTOM PC BUILDER Value: 65% - Good Total price: $566

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) December 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 2 years ago.


2 years 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 $145Nvidia GTX 1660S (Super) $244Crucial MX500 250GB $39
Intel Core i5-9600K $200Nvidia RTX 2060 $324Samsung 850 Evo 120GB $150
Intel Core i7-9700K $360AMD RX 590 $180Samsung 860 Evo 250GB $54
Seagate Barracuda 1TB (2016) $32Corsair Vengeance LPX DDR4 3200 C16 2x8GB $76SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $38Corsair Vengeance LPX DDR4 3000 C15 2x8GB $58SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $613SanDisk Extreme 16GB $24
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