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 20,544 user samples
16,312 User Benchmarks
Best Bench: 115% 42GB free
Worst Bench: 59% 73GB free
Poor: 59% Great: 115%
SPEED RANK: 65th / 850
4,232 User Benchmarks
Best Bench: 78% 111GB free
Worst Bench: 48% 70GB free
Poor: 48% Great: 78%
SPEED RANK: 432nd / 850
Effective Speed
Effective SSD Speed
93.5 % Much faster effective speed.
63.6 % -47%
Avg. Sequential Read Speed
492 MB/s +4% 471 MB/s -4%
Avg. Sequential Write Speed
389 MB/s Hugely faster write speed.
144 MB/s -170%
4K Read
Avg. 4K Random Read Speed
37.9 MB/s Much faster random read.
28.3 MB/s -34%
4K Write
Avg. 4K Random Write Speed
76.2 MB/s 0% 76.2 MB/s 0%
Avg. Sequential Mixed IO Speed
389 MB/s Hugely faster mixed IO speed.
211 MB/s -84%
4K Mixed
Avg. 4K Random Mixed IO Speed
31.5 MB/s Hugely faster random mixed IO.
15.7 MB/s -101%
Peak Sequential Read Speed
518 MB/s +0% 516 MB/s -0%
Peak Sequential Write Speed
416 MB/s Hugely faster peak write speed.
165 MB/s -152%
4K Read
Peak 4K Random Read Speed
47.7 MB/s Faster peak random read.
38.9 MB/s -23%
4K Write
Peak 4K Random Write Speed
111 MB/s -5% 117 MB/s Slightly faster peak random write.
Peak Sequential Mixed IO Speed
419 MB/s Much faster peak mixed IO speed.
240 MB/s -75%
4K Mixed
Peak 4K Random Mixed IO Speed
45.3 MB/s Hugely faster peak random mixed IO.
21.6 MB/s -110%
Market Share
Based on 2,859,716 SSDs tested.
Market Share
Market Share (trailing 30 days)
1.08 % Hugely higher market share.
0.21 % -414%
Value For Money
57.7 % Much better value.
39.8 % -45%
User Rating
UBM User Rating
72 % More popular.
61 % -18%
Price (score)
$86 -2% $85 +2%
29 Months Much more recent.
63 Months -54%
DQ Read
Peak 4K-64Thread Read Speed
377 MB/s Much faster peak deep queue read.
231 MB/s -63%
DQ Write
Peak 4K-64Thread Write Speed
284 MB/s Much faster peak deep queue write.
162 MB/s -75%
AS-SSD Total
AS-SSD Total Score
1,170 Pts Much stronger server IO.
780 Pts -50%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
112 MB/s Hugely faster peak deep queue mixed IO.
60 MB/s -87%
ADQ Read
Avg. 4K-64Thread Read Speed
200 MB/s Much faster deep queue read.
138 MB/s -45%
ADQ Write
Avg. 4K-64Thread Write Speed
183 MB/s Much faster deep queue write.
132 MB/s -39%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
64.1 MB/s Much faster deep queue mixed IO.
38.5 MB/s -66%
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) May 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 $368Samsung 850 Evo 250GB $99
Intel Core i5-7600K $229AMD RX 480 $227Samsung 850 Pro 256GB $132
AMD Ryzen 7 1700 $300Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $160
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $700SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46Corsair Vengeance LPX DDR4 3200 C16 2x8GB $136SanDisk Ultra Fit 32GB $12
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