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

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

Real World Speed
Performance profile from 29,221 user samples
20,904 User Benchmarks
Best Bench: 114% 20GB free
Worst Bench: 68% 8GB free
Poor: 68% Great: 114%
SPEED RANK: 69th / 853
8,317 User Benchmarks
Best Bench: 100% 87GB free
Worst Bench: 53% 22GB free
Poor: 53% Great: 100%
SPEED RANK: 219th / 853
Effective Speed
Effective SSD Speed
93.3 % Faster effective speed.
77.9 % -20%
Avg. Sequential Read Speed
496 MB/s +2% 484 MB/s -2%
Avg. Sequential Write Speed
393 MB/s Much faster write speed.
297 MB/s -32%
4K Read
Avg. 4K Random Read Speed
37.8 MB/s Much faster random read.
28.6 MB/s -32%
4K Write
Avg. 4K Random Write Speed
75.9 MB/s -1% 76.4 MB/s +1%
Avg. Sequential Mixed IO Speed
391 MB/s Faster mixed IO speed.
324 MB/s -21%
4K Mixed
Avg. 4K Random Mixed IO Speed
31 MB/s Much faster random mixed IO.
20 MB/s -55%
Peak Sequential Read Speed
518 MB/s -0% 520 MB/s +0%
Peak Sequential Write Speed
416 MB/s -6% 439 MB/s Slightly faster peak write speed.
4K Read
Peak 4K Random Read Speed
47.1 MB/s Much faster peak random read.
36 MB/s -31%
4K Write
Peak 4K Random Write Speed
108 MB/s -7% 116 MB/s Slightly faster peak random write.
Peak Sequential Mixed IO Speed
420 MB/s -13% 474 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
44.1 MB/s Much faster peak random mixed IO.
25.7 MB/s -72%
Market Share
Based on 3,271,260 SSDs tested.
Market Share
Market Share (trailing 30 days)
1.09 % Hugely higher market share.
0.53 % -106%
Value For Money
56.4 % Much better value.
37.2 % -52%
User Rating
UBM User Rating
73 % More popular.
63 % -16%
Price (score)
$89 Much cheaper.
$130 -32%
31 Months Much more recent.
57 Months -46%
DQ Read
Peak 4K-64Thread Read Speed
378 MB/s +3% 367 MB/s -3%
DQ Write
Peak 4K-64Thread Write Speed
284 MB/s -11% 314 MB/s Slightly faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,167 Pts -0% 1,170 Pts +0%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
111 MB/s Much faster peak deep queue mixed IO.
78.9 MB/s -41%
ADQ Read
Avg. 4K-64Thread Read Speed
189 MB/s -4% 196 MB/s +4%
ADQ Write
Avg. 4K-64Thread Write Speed
181 MB/s +3% 175 MB/s -3%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
61.5 MB/s Much faster deep queue mixed IO.
47.1 MB/s -31%
120GB 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

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The Best.
Intel Core i7-7700K $295Nvidia GTX 1070 $390Samsung 850 Evo 250GB $97
AMD Ryzen 7 1700 $268AMD RX 480 $260Samsung 850 Pro 256GB $136
Intel Core i5-7600K $224Nvidia GTX 1060-6GB $239Samsung 850 Evo 500GB $165
Seagate Barracuda 1TB (2016) $50G.SKILL Trident Z DDR4 3200 C14 4x16GB $714SanDisk Extreme 64GB $34
Seagate Barracuda 3TB (2016) $83Corsair Vengeance LPX DDR4 3000 C15 2x8GB $132SanDisk Extreme 32GB $23
Seagate Barracuda 7200.14 1TB $44HyperX Fury DDR4 2133 C14 2x8GB $133SanDisk Ultra Fit 32GB $13
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