Real World Speed
Performance profile from 8,396 user samples
8,396 User Benchmarks
Best Bench: 99% 35GB free
Worst Bench: 52% 23GB free
Poor: 52% Great: 99%
SPEED RANK: 213th / 853
Effective Speed
Effective SSD Speed
78.3 % +3% 76.1 % -3%
Avg. Sequential Read Speed
486 MB/s +4% 465 MB/s -4%
Avg. Sequential Write Speed
300 MB/s +2% 294 MB/s -2%
4K Read
Avg. 4K Random Read Speed
28.9 MB/s +1% 28.7 MB/s -1%
4K Write
Avg. 4K Random Write Speed
77 MB/s -0% 77.1 MB/s +0%
Avg. Sequential Mixed IO Speed
328 MB/s +3% 319 MB/s -3%
4K Mixed
Avg. 4K Random Mixed IO Speed
20.1 MB/s +1% 20 MB/s -1%
Peak Sequential Read Speed
521 MB/s +4% 501 MB/s -4%
Peak Sequential Write Speed
438 MB/s Faster peak write speed.
345 MB/s -27%
4K Read
Peak 4K Random Read Speed
36 MB/s -1% 36.3 MB/s +1%
4K Write
Peak 4K Random Write Speed
116 MB/s +2% 113 MB/s -2%
Peak Sequential Mixed IO Speed
475 MB/s Faster peak mixed IO speed.
376 MB/s -26%
4K Mixed
Peak 4K Random Mixed IO Speed
25.6 MB/s -7% 27.3 MB/s Slightly faster peak random mixed IO.
Market Share
Based on 3,339,136 SSDs tested.
User Rating
UBM User Rating
63 % +0% 62.9 % -0%
Market Share
Market Share (trailing 30 days)
0.61 % Slightly higher market share.
0.56 % -9%
Price (score)
$130 -33% 97.8 USD Much cheaper.
Value For Money
37.4 % -23% 45.8 % Better value.
DQ Read
Peak 4K-64Thread Read Speed
366 MB/s Faster peak deep queue read.
308 MB/s -19%
DQ Write
Peak 4K-64Thread Write Speed
310 MB/s Faster peak deep queue write.
264 MB/s -17%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
77.5 MB/s +0% 77.5 MB/s -0%
ADQ Read
Avg. 4K-64Thread Read Speed
186 MB/s Faster deep queue read.
158 MB/s -18%
ADQ Write
Avg. 4K-64Thread Write Speed
178 MB/s +5% 170 MB/s -5%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
45.8 MB/s +0% 45.6 MB/s -0%
57 Months -29% 44.2 Months More recent.
AS-SSD Total
AS-SSD Total Score
1,165 Pts Slightly stronger server IO.
1,015 Pts -15%
128GB   —

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]


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

 Best User Rated

The Best.
Intel Core i7-7700K $309Nvidia GTX 1070 $390Samsung 850 Evo 250GB $83
AMD Ryzen 7 1700 $280AMD RX 480 $366Samsung 850 Pro 256GB $120
Intel Core i5-7600K $235Nvidia GTX 1060-6GB $33Samsung 850 Evo 500GB $155
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 $44HyperX Fury DDR4 2133 C14 2x8GB $140SanDisk Ultra Fit 32GB $13
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