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

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

Real World Speed
Performance profile from 37,760 user samples
12,327 User Benchmarks
Best Bench: 99% 118GB free
Worst Bench: 54% 30GB free
Poor: 54% Great: 99%
SPEED RANK: 221st / 863
25,433 User Benchmarks
Best Bench: 115% 14GB free
Worst Bench: 64% 10GB free
Poor: 64% Great: 115%
SPEED RANK: 72nd / 863
Effective Speed
Effective SSD Speed
78.7 % -19% 93.5 % Faster effective speed.
Avg. Sequential Read Speed
485 MB/s -2% 493 MB/s +2%
Avg. Sequential Write Speed
300 MB/s -29% 388 MB/s Faster write speed.
4K Read
Avg. 4K Random Read Speed
29.1 MB/s -29% 37.6 MB/s Faster random read.
4K Write
Avg. 4K Random Write Speed
78.4 MB/s +2% 77.1 MB/s -2%
Avg. Sequential Mixed IO Speed
326 MB/s -20% 390 MB/s Faster mixed IO speed.
4K Mixed
Avg. 4K Random Mixed IO Speed
20.2 MB/s -57% 31.7 MB/s Much faster random mixed IO.
Peak Sequential Read Speed
522 MB/s +1% 518 MB/s -1%
Peak Sequential Write Speed
438 MB/s Slightly faster peak write speed.
416 MB/s -5%
4K Read
Peak 4K Random Read Speed
35.9 MB/s -32% 47.4 MB/s Much faster peak random read.
4K Write
Peak 4K Random Write Speed
115 MB/s +5% 110 MB/s -5%
Peak Sequential Mixed IO Speed
472 MB/s Slightly faster peak mixed IO speed.
420 MB/s -12%
4K Mixed
Peak 4K Random Mixed IO Speed
25.4 MB/s -79% 45.4 MB/s Much faster peak random mixed IO.
Market Share
Based on 4,480,081 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.45 % -98% 0.89 % Hugely higher market share.
Value For Money
32.1 % -99% 63.9 % Hugely better value.
User Rating
UBM User Rating
63 % -17% 74 % More popular.
Price (score)
$160 -53% $76 Much cheaper.
61 Months -43% 35 Months Much more recent.
DQ Read
Peak 4K-64Thread Read Speed
365 MB/s -4% 378 MB/s +4%
DQ Write
Peak 4K-64Thread Write Speed
312 MB/s Slightly faster peak deep queue write.
284 MB/s -10%
AS-SSD Total
AS-SSD Total Score
1,164 Pts -0% 1170 Pts +0%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
77.4 MB/s -45% 112 MB/s Much faster peak deep queue mixed IO.
ADQ Read
Avg. 4K-64Thread Read Speed
192 MB/s -2% 195 MB/s +2%
ADQ Write
Avg. 4K-64Thread Write Speed
176 MB/s -3% 182 MB/s +3%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
45.5 MB/s -44% 65.3 MB/s Much faster deep queue mixed IO.
128GB 120GB

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) November 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 $280Nvidia GTX 1070 $410Samsung 850 Evo 250GB $88
AMD Ryzen 7 1700 $250AMD RX 480 $240Samsung 850 Pro 256GB $110
Intel Core i5-7600K $180Nvidia GTX 1060-6GB $240Samsung 850 Evo 500GB $150
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $160SanDisk Extreme 64GB $30
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $1,050SanDisk Extreme 32GB $17
Seagate Barracuda 7200.14 1TB $52Corsair Vengeance LPX DDR4 3200 C16 2x8GB $199SanDisk Ultra Fit 32GB $12
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