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

Controller: LSI SandForce SF2281. Flash Memory: Intel Synchronous 25nm MLC

Real World Speed
Performance profile from 12,941 user samples
8,381 User Benchmarks
Best Bench: 100% 35GB free
Worst Bench: 52% 9GB free
Poor: 52% Great: 100%
SPEED RANK: 215th / 853
4,560 User Benchmarks
Best Bench: 78% 67GB free
Worst Bench: 47% 52GB free
Poor: 47% Great: 78%
SPEED RANK: 453rd / 853
Effective Speed
Effective SSD Speed
78.3 % Faster effective speed.
62.6 % -25%
Avg. Sequential Read Speed
485 MB/s +3% 470 MB/s -3%
Avg. Sequential Write Speed
299 MB/s Hugely faster write speed.
143 MB/s -109%
4K Read
Avg. 4K Random Read Speed
28.8 MB/s +3% 27.9 MB/s -3%
4K Write
Avg. 4K Random Write Speed
76.7 MB/s +4% 74 MB/s -4%
Avg. Sequential Mixed IO Speed
327 MB/s Much faster mixed IO speed.
210 MB/s -56%
4K Mixed
Avg. 4K Random Mixed IO Speed
20.2 MB/s Much faster random mixed IO.
15.2 MB/s -33%
Peak Sequential Read Speed
521 MB/s +1% 515 MB/s -1%
Peak Sequential Write Speed
439 MB/s Hugely faster peak write speed.
164 MB/s -168%
4K Read
Peak 4K Random Read Speed
36 MB/s -7% 38.5 MB/s Slightly faster peak random read.
4K Write
Peak 4K Random Write Speed
116 MB/s -1% 117 MB/s +1%
Peak Sequential Mixed IO Speed
475 MB/s Hugely faster peak mixed IO speed.
244 MB/s -95%
4K Mixed
Peak 4K Random Mixed IO Speed
25.7 MB/s Faster peak random mixed IO.
21.2 MB/s -21%
Market Share
Based on 3,328,095 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.61 % Hugely higher market share.
0.25 % -144%
Value For Money
37.4 % -5% 39.2 % +5%
User Rating
UBM User Rating
63 % +3% 61 % -3%
Price (score)
$130 -35% $85 Much cheaper.
57 Months Slightly more recent.
65 Months -12%
DQ Read
Peak 4K-64Thread Read Speed
367 MB/s Much faster peak deep queue read.
231 MB/s -59%
DQ Write
Peak 4K-64Thread Write Speed
311 MB/s Hugely faster peak deep queue write.
165 MB/s -88%
AS-SSD Total
AS-SSD Total Score
1,167 Pts Much stronger server IO.
782 Pts -49%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
78.6 MB/s Much faster peak deep queue mixed IO.
60 MB/s -31%
ADQ Read
Avg. 4K-64Thread Read Speed
190 MB/s Much faster deep queue read.
134 MB/s -42%
ADQ Write
Avg. 4K-64Thread Write Speed
179 MB/s Much faster deep queue write.
130 MB/s -38%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
46.6 MB/s Faster deep queue mixed IO.
38.6 MB/s -21%
128GB 120GB

The 128GB 840 Pro is a rock solid performer. On release, nearly a year and a half ago, the Pro smashed several speed records. Today, with sequential read/write speeds of 519/438 MBps, the Pro is still one of the fastest SSDs available. One of the Pro's top competitors is Samsungs own, newer 840 Evo. Looking at a raw synthetic speed comparison of the 128GB Pro and Evo is a little misleading. On the face of it the Pro only has a marginal lead over the Evo. This due to the fact that the Evo can only maintain its burst write speed for transfers of up to 3GB, the size of its SLC cache. The Pro on the other hand can sustain higher throughputs indefinitely. The Pro also utilizes MLC which is rated for far more erase cycles than the TLC used in the Evo. Server IO is often continuous and would quickly exhaust the 3GB cache on the Evo but for typical consumer use the Evo will remain within the SLC cache most of the time. [Feb '14 SSDrivePro]


The Intel 520 Series was Intel's first SSD to feature a Sandforce 2281 controller. This controller has powered countless SSDs over the last three years but is now dated and is known to be limited in the area of incompressible write speed. The 120GB Intel 520 scored peak and average sequential read/write speeds of 514/157 and 421/133. These read speeds are good but the peak write of 157 MB/s lags the group leaders average of 313 MB/s by nearly 100%. This relative inability to write lowers the 520's overall effective speed to 403 MB/s or 15% lower than the 459 MB/s achieved by the group leaders. At two years of age the Intel 520 can no longer compete with newer drives, there is far better value available amongst the group leaders[Feb '14 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) July 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 $309Nvidia GTX 1070 $390Samsung 850 Evo 250GB $96
AMD Ryzen 7 1700 $291AMD RX 480 $379Samsung 850 Pro 256GB $120
Intel Core i5-7600K $235Nvidia GTX 1060-6GB $33Samsung 850 Evo 500GB $23
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $140SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $83G.SKILL Trident Z DDR4 3200 C14 4x16GB $714SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $40HyperX Fury DDR4 2133 C14 2x8GB $140SanDisk Ultra Fit 32GB $13
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