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 39,666 user samples
27,784 User Benchmarks
Best Bench: 113% 25GB free
Worst Bench: 60% 28GB free
Poor: 60% Great: 113%
SPEED RANK: 73rd / 873
11,882 User Benchmarks
Best Bench: 98% 29GB free
Worst Bench: 53% 5GB free
Poor: 53% Great: 98%
SPEED RANK: 233rd / 873
Effective Speed
Effective SSD Speed
93.3 % Faster effective speed.
77.8 % -20%
Avg. Sequential Read Speed
489 MB/s +1% 483 MB/s -1%
Avg. Sequential Write Speed
385 MB/s Much faster write speed.
294 MB/s -31%
4K Read
Avg. 4K Random Read Speed
38 MB/s Much faster random read.
28.6 MB/s -33%
4K Write
Avg. 4K Random Write Speed
76 MB/s -2% 77.6 MB/s +2%
Avg. Sequential Mixed IO Speed
389 MB/s Faster mixed IO speed.
321 MB/s -21%
4K Mixed
Avg. 4K Random Mixed IO Speed
31.9 MB/s Much faster random mixed IO.
20 MB/s -59%
Peak Sequential Read Speed
518 MB/s -1% 521 MB/s +1%
Peak Sequential Write Speed
416 MB/s -5% 436 MB/s +5%
4K Read
Peak 4K Random Read Speed
47.1 MB/s Much faster peak random read.
35.5 MB/s -33%
4K Write
Peak 4K Random Write Speed
105 MB/s -6% 111 MB/s Slightly faster peak random write.
Peak Sequential Mixed IO Speed
420 MB/s -12% 472 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
45.2 MB/s Hugely faster peak random mixed IO.
25.1 MB/s -80%
Market Share
Based on 5,230,364 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.9 % Hugely higher market share.
0.41 % -120%
Value For Money
52.8 % Much better value.
31.8 % -66%
User Rating
UBM User Rating
75 % More popular.
63 % -19%
Price (score)
$97 Much cheaper.
$160 -39%
37 Months Much more recent.
63 Months -41%
DQ Read
Peak 4K-64Thread Read Speed
373 MB/s +3% 361 MB/s -3%
DQ Write
Peak 4K-64Thread Write Speed
281 MB/s -11% 312 MB/s Slightly faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,154 Pts +0% 1153 Pts -0%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
110 MB/s Much faster peak deep queue mixed IO.
78.4 MB/s -40%
ADQ Read
Avg. 4K-64Thread Read Speed
199 MB/s +2% 196 MB/s -2%
ADQ Write
Avg. 4K-64Thread Write Speed
182 MB/s +5% 174 MB/s -5%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
65.8 MB/s Much faster deep queue mixed IO.
45.7 MB/s -44%
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) 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 $430Samsung 850 Evo 250GB $90
AMD Ryzen 7 1700 $290Nvidia GTX 1060-6GB $275Samsung 850 Evo 500GB $140
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 $65
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $931SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $51Corsair Vengeance LPX DDR4 3200 C16 2x8GB $220SanDisk Ultra Fit 32GB $12
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