Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC.

Controller: Silicon Motion SM2246EN. Flash Memory: Micron 16nm MLC.

Real World Speed
Performance profile from 25,270 user samples
16,932 User Benchmarks
Best Bench: 109% 96GB free
Worst Bench: 54% 26GB free
Poor: 54% Great: 109%
SPEED RANK: 128th / 862
8,338 User Benchmarks
Best Bench: 100% 63GB free
Worst Bench: 64% 232GB free
Poor: 64% Great: 100%
SPEED RANK: 128th / 862
Effective Speed
Effective SSD Speed
85.2 % -0% 85.3 % +0%
Avg. Sequential Read Speed
492 MB/s -2% 501 MB/s +2%
Avg. Sequential Write Speed
365 MB/s +3% 355 MB/s -3%
4K Read
Avg. 4K Random Read Speed
29.1 MB/s Faster random read.
25.3 MB/s -15%
4K Write
Avg. 4K Random Write Speed
80.6 MB/s +1% 79.9 MB/s -1%
Avg. Sequential Mixed IO Speed
398 MB/s -3% 410 MB/s +3%
4K Mixed
Avg. 4K Random Mixed IO Speed
22.5 MB/s -24% 27.8 MB/s Faster random mixed IO.
Peak Sequential Read Speed
524 MB/s 0% 524 MB/s 0%
Peak Sequential Write Speed
498 MB/s Much faster peak write speed.
371 MB/s -34%
4K Read
Peak 4K Random Read Speed
36.5 MB/s Faster peak random read.
30.6 MB/s -19%
4K Write
Peak 4K Random Write Speed
117 MB/s +3% 114 MB/s -3%
Peak Sequential Mixed IO Speed
509 MB/s Faster peak mixed IO speed.
432 MB/s -18%
4K Mixed
Peak 4K Random Mixed IO Speed
29.3 MB/s -29% 37.8 MB/s Faster peak random mixed IO.
Market Share
Based on 4,430,761 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.55 % Much higher market share.
0.36 % -53%
Value For Money
49.7 % -19% 59 % Better value.
User Rating
UBM User Rating
64 % +3% 62 % -3%
Price (score)
$199 -22% $155 Cheaper.
61 Months -44% 34 Months Much more recent.
DQ Read
Peak 4K-64Thread Read Speed
376 MB/s Much faster peak deep queue read.
278 MB/s -35%
DQ Write
Peak 4K-64Thread Write Speed
324 MB/s +3% 314 MB/s -3%
AS-SSD Total
AS-SSD Total Score
1,205 Pts Stronger server IO.
1,014 Pts -19%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
90.6 MB/s Faster peak deep queue mixed IO.
72.4 MB/s -25%
ADQ Read
Avg. 4K-64Thread Read Speed
209 MB/s Faster deep queue read.
164 MB/s -27%
ADQ Write
Avg. 4K-64Thread Write Speed
198 MB/s -7% 212 MB/s Slightly faster deep queue write.
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
52.7 MB/s Slightly faster deep queue mixed IO.
48.9 MB/s -8%
256GB 250GB

The 840 Pro is stunning. Samsung have created a completely in-house package including both the controller and their own new 21nm toggle mode NAND. On release (Oct '12) this was the fastest performing deep queue depth consumer grade SSD available. Fast forward six months (Apr '13) and the 840 Pro still holds both the random read/write deep queue depth speed records of 384 MB/s and 326 MB/s, impressive considering how fast the SSD space tends to move. There are no obvious weaknesses, in-fact the 840 pro takes first place in nearly all of the speed categories and is only seriously rivalled by one drive, the OCZ Vector. To conclude, in terms of both outright performance, particularly server orientated, and value for money the 256GB and 128GB 840 Pros are amongst the top handful of drives currently available. [Jun '13 SSDrivePro]


The 250GB Crucial BX100 SSD is the value orientated variant of Crucial's M range of SSDs. The BX100 uses the same NAND as its premium MX200 sibling but the BX100 uses a Silicon Motion controller as opposed to the Marvel controller found in the MX range. Feature wise the BX100 is missing SLC caching and there is no hardware encryption (so security frameworks such as windows Bitlocker will operate less efficiently). In terms of I/O performance the BX100 looks promising. Comparing the BX100 and MX100 shows that the newer BX100 may be faster than its predecessor but as yet there are insufficient user benchmarks to draw any definitive conclusions. The BX100 has only just started hitting the shelves so there's plenty of room for price reductions from its already reasonable price tag. I will revisit this review when I have more performance data for the BX100. [Jan '15 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) November 2017 SSD Rankings.

Welcome to our consumer SSD comparison. We calculate effective speed based on real world performance then adjust by cost per GB to yield a value for money rating. Calculated values don't always tell the whole picture so we check them against thousands of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top SSDs. Share your opinion by voting. [SSDrivePro]

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 (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

 Frequently Asked Questions

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The Best.
Intel Core i7-7700K $288Nvidia GTX 1070 $410Samsung 850 Evo 250GB $90
AMD Ryzen 7 1700 $285AMD RX 480 $240Samsung 850 Pro 256GB $110
Intel Core i5-7600K $200Nvidia GTX 1060-6GB $260Samsung 850 Evo 500GB $150
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $189SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $1,050SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $55Corsair Vengeance LPX DDR4 3200 C16 2x8GB $195SanDisk Ultra Fit 32GB $12
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