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

Controller: Marvell SS889175. Memory: SanDisk 19nm eX2 ABL MLC.

Real World Speed
Performance profile from 13,609 user samples
9,703 User Benchmarks
Best Bench: 101% 20GB free
Worst Bench: 58% 13GB free
Poor: 58% Great: 101%
SPEED RANK: 202nd / 859
3,906 User Benchmarks
Best Bench: 81% 7GB free
Worst Bench: 47% 10GB free
Poor: 47% Great: 81%
SPEED RANK: 430th / 859
Effective Speed
Effective SSD Speed
79.8 % Faster effective speed.
64.5 % -24%
Avg. Sequential Read Speed
488 MB/s Faster read speed.
403 MB/s -21%
Avg. Sequential Write Speed
311 MB/s Much faster write speed.
210 MB/s -48%
4K Read
Avg. 4K Random Read Speed
29.1 MB/s Slightly faster random read.
26.1 MB/s -11%
4K Write
Avg. 4K Random Write Speed
77.9 MB/s Slightly faster random write.
70.6 MB/s -10%
Avg. Sequential Mixed IO Speed
340 MB/s Much faster mixed IO speed.
249 MB/s -37%
4K Mixed
Avg. 4K Random Mixed IO Speed
20.1 MB/s Faster random mixed IO.
17.3 MB/s -16%
Peak Sequential Read Speed
521 MB/s Faster peak read speed.
443 MB/s -18%
Peak Sequential Write Speed
439 MB/s Much faster peak write speed.
278 MB/s -58%
4K Read
Peak 4K Random Read Speed
36.1 MB/s Slightly faster peak random read.
33 MB/s -9%
4K Write
Peak 4K Random Write Speed
115 MB/s Slightly faster peak random write.
107 MB/s -7%
Peak Sequential Mixed IO Speed
476 MB/s Much faster peak mixed IO speed.
314 MB/s -52%
4K Mixed
Peak 4K Random Mixed IO Speed
25.9 MB/s Slightly faster peak random mixed IO.
23.5 MB/s -10%
Market Share
Based on 3,837,917 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.54 % Hugely higher market share.
0.2 % -170%
Value For Money
32.6 % -36% 44.3 % Much better value.
User Rating
UBM User Rating
63 % +3% 61 % -3%
Price (score)
$160 -50% $80 Much cheaper.
59 Months -5% 56 Months Slightly more recent.
DQ Read
Peak 4K-64Thread Read Speed
366 MB/s Faster peak deep queue read.
310 MB/s -18%
DQ Write
Peak 4K-64Thread Write Speed
316 MB/s Much faster peak deep queue write.
196 MB/s -61%
AS-SSD Total
AS-SSD Total Score
1,170 Pts Stronger server IO.
920 Pts -27%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
79.3 MB/s Much faster peak deep queue mixed IO.
47 MB/s -69%
ADQ Read
Avg. 4K-64Thread Read Speed
204 MB/s Much faster deep queue read.
154 MB/s -32%
ADQ Write
Avg. 4K-64Thread Write Speed
184 MB/s Much faster deep queue write.
138 MB/s -33%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
48 MB/s Much faster deep queue mixed IO.
30.8 MB/s -56%
128GB 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]


The 128GB Sandisk Ultra Plus proved to be a bit of a disappointment in comparison to its larger 256GB sibling. The 256GB version has more NAND modules which enable peak sequential write speeds in the region of 450 MB/s. On the 128GB version we saw a peak sequential write speed of just 279 MB/s which is significantly lower than the market leaders which also manage to hit the high 400's. Across the core performance metrics, the 128GB Ultra Plus is around 25% slower than the average of its top competitors and, unlike its 256GB sibling, really struggles to keep up with its direct competition. In terms of value for money the Ultra Plus fares a little better thanks to its reasonably low price tag but there are far better deals to be had in the 128GB category. [Feb '14 SSDrivePro]


Solid State Drive Rankings (Price vs Performance) September 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 $297Nvidia GTX 1070 $410Samsung 850 Evo 250GB $95
AMD Ryzen 7 1700 $270AMD RX 480 $350Samsung 850 Pro 256GB $120
Intel Core i5-7600K $220Nvidia GTX 1060-6GB $265Samsung 850 Evo 500GB $150
Seagate Barracuda 1TB (2016) $45G.SKILL Trident Z DDR4 3200 C14 4x16GB $724SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $77Corsair Vengeance LPX DDR4 3000 C15 2x8GB $152SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $56HyperX Fury DDR4 2133 C14 2x8GB $141SanDisk Extreme 16GB $20
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