Controller: Samsung Dual Core MGX. Memory: Samsung 40nm TLC V-NAND

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

Real World Speed
Performance profile from 33,473 user samples
27,151 User Benchmarks
Best Bench: 113% 25GB free
Worst Bench: 64% 26GB free
Poor: 64% Great: 113%
SPEED RANK: 71st / 869
6,322 User Benchmarks
Best Bench: 78% 72GB free
Worst Bench: 48% 11GB free
Poor: 48% Great: 78%
SPEED RANK: 459th / 869
Effective Speed
Effective SSD Speed
93.5 % Much faster effective speed.
63.3 % -48%
Avg. Sequential Read Speed
492 MB/s +4% 475 MB/s -4%
Avg. Sequential Write Speed
389 MB/s Hugely faster write speed.
143 MB/s -172%
4K Read
Avg. 4K Random Read Speed
38 MB/s Much faster random read.
27.8 MB/s -37%
4K Write
Avg. 4K Random Write Speed
76.2 MB/s -1% 76.9 MB/s +1%
Avg. Sequential Mixed IO Speed
393 MB/s Hugely faster mixed IO speed.
211 MB/s -86%
4K Mixed
Avg. 4K Random Mixed IO Speed
31.8 MB/s Hugely faster random mixed IO.
15.1 MB/s -111%
Peak Sequential Read Speed
518 MB/s +0% 516 MB/s -0%
Peak Sequential Write Speed
416 MB/s Hugely faster peak write speed.
162 MB/s -157%
4K Read
Peak 4K Random Read Speed
46.9 MB/s Faster peak random read.
38.4 MB/s -22%
4K Write
Peak 4K Random Write Speed
105 MB/s -9% 114 MB/s Slightly faster peak random write.
Peak Sequential Mixed IO Speed
420 MB/s Much faster peak mixed IO speed.
239 MB/s -76%
4K Mixed
Peak 4K Random Mixed IO Speed
45.1 MB/s Hugely faster peak random mixed IO.
21.3 MB/s -112%
Market Share
Based on 5,263,903 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.85 % Hugely higher market share.
0.15 % -467%
Value For Money
52.9 % Hugely better value.
25.3 % -109%
User Rating
UBM User Rating
75 % More popular.
61 % -23%
Price (score)
$97 Much cheaper.
$154 -37%
37 Months Much more recent.
71 Months -48%
DQ Read
Peak 4K-64Thread Read Speed
370 MB/s Much faster peak deep queue read.
231 MB/s -60%
DQ Write
Peak 4K-64Thread Write Speed
282 MB/s Much faster peak deep queue write.
164 MB/s -72%
AS-SSD Total
AS-SSD Total Score
1150 Pts Much stronger server IO.
777 Pts -48%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
111 MB/s Hugely faster peak deep queue mixed IO.
59.2 MB/s -88%
ADQ Read
Avg. 4K-64Thread Read Speed
192 MB/s Much faster deep queue read.
137 MB/s -40%
ADQ Write
Avg. 4K-64Thread Write Speed
181 MB/s Much faster deep queue write.
134 MB/s -35%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
64.1 MB/s Much faster deep queue mixed IO.
37.5 MB/s -71%
120GB 120GB

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) January 2018 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 $280Nvidia GTX 1070 $133Samsung 850 Evo 250GB $90
AMD Ryzen 7 1700 $290Nvidia GTX 1060-6GB $275Samsung 850 Evo 500GB $138
Intel Core i5-7600K $210AMD RX 480 $400Samsung 850 Pro 256GB $110
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $205SanDisk Extreme 64GB $50
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $53Corsair Vengeance LPX DDR4 3200 C16 2x8GB $220SanDisk Ultra Fit 32GB $12
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