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 33,723 user samples
23,657 User Benchmarks
Best Bench: 115% 55GB free
Worst Bench: 71% 46GB free
Poor: 71% Great: 115%
SPEED RANK: 67th / 859
10,066 User Benchmarks
Best Bench: 101% 20GB free
Worst Bench: 58% 13GB free
Poor: 58% Great: 101%
SPEED RANK: 203rd / 859
Effective Speed
Effective SSD Speed
94.8 % Faster effective speed.
79.5 % -19%
Avg. Sequential Read Speed
498 MB/s +2% 489 MB/s -2%
Avg. Sequential Write Speed
393 MB/s Faster write speed.
309 MB/s -27%
4K Read
Avg. 4K Random Read Speed
38.4 MB/s Much faster random read.
29.1 MB/s -32%
4K Write
Avg. 4K Random Write Speed
78 MB/s +1% 77.4 MB/s -1%
Avg. Sequential Mixed IO Speed
394 MB/s Faster mixed IO speed.
338 MB/s -17%
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 -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.
36.1 MB/s -30%
4K Write
Peak 4K Random Write Speed
109 MB/s -6% 115 MB/s Slightly faster peak random write.
Peak Sequential Mixed IO Speed
420 MB/s -14% 477 MB/s Slightly faster peak mixed IO speed.
4K Mixed
Peak 4K Random Mixed IO Speed
45.3 MB/s Much faster peak random mixed IO.
25.8 MB/s -76%
Market Share
Based on 3,862,640 SSDs tested.
Market Share
Market Share (trailing 30 days)
1.17 % Hugely higher market share.
0.54 % -117%
Value For Money
66.8 % Hugely better value.
32.5 % -106%
User Rating
UBM User Rating
73 % More popular.
63 % -16%
Price (score)
$73 Much cheaper.
$160 -55%
33 Months Much more recent.
59 Months -44%
DQ Read
Peak 4K-64Thread Read Speed
376 MB/s +2% 367 MB/s -2%
DQ Write
Peak 4K-64Thread Write Speed
285 MB/s -11% 315 MB/s Slightly faster peak deep queue write.
AS-SSD Total
AS-SSD Total Score
1,166 Pts -0% 1,171 Pts +0%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
112 MB/s Much faster peak deep queue mixed IO.
79.5 MB/s -41%
ADQ Read
Avg. 4K-64Thread Read Speed
198 MB/s -2% 202 MB/s +2%
ADQ Write
Avg. 4K-64Thread Write Speed
190 MB/s +4% 183 MB/s -4%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
64.8 MB/s Much faster deep queue mixed IO.
47.9 MB/s -35%
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) 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

 Best User Rated

The Best.
Intel Core i7-7700K $295Nvidia GTX 1070 $410Samsung 850 Evo 250GB $97
AMD Ryzen 7 1700 $270AMD RX 480 $350Samsung 850 Pro 256GB $120
Intel Core i5-7600K $210Nvidia GTX 1060-6GB $263Samsung 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 $155SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $56HyperX Fury DDR4 2133 C14 2x8GB $141SanDisk Extreme 16GB $20
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