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

Controller: LSI SandForce SF2281. Flash Memory: Toshiba 19nm Toggle Mode MLC.

Real World Speed
Performance profile from 112,048 user samples
12,059 User Benchmarks
Best Bench: 98% 29GB free
Worst Bench: 53% 5GB free
Poor: 53% Great: 98%
SPEED RANK: 226th / 873
99,989 User Benchmarks
Best Bench: 64% 112GB free
Worst Bench: 30% 33GB free
Poor: 30% Great: 64%
SPEED RANK: 670th / 873
Effective Speed
Effective SSD Speed
78.3 % Much faster effective speed.
47.4 % -65%
Avg. Sequential Read Speed
485 MB/s Much faster read speed.
337 MB/s -44%
Avg. Sequential Write Speed
297 MB/s Hugely faster write speed.
109 MB/s -172%
4K Read
Avg. 4K Random Read Speed
28.7 MB/s Much faster random read.
19.5 MB/s -47%
4K Write
Avg. 4K Random Write Speed
78.1 MB/s Slightly faster random write.
69.1 MB/s -13%
Avg. Sequential Mixed IO Speed
325 MB/s Hugely faster mixed IO speed.
144 MB/s -126%
4K Mixed
Avg. 4K Random Mixed IO Speed
20.1 MB/s Much faster random mixed IO.
11.8 MB/s -70%
Peak Sequential Read Speed
521 MB/s +4% 503 MB/s -4%
Peak Sequential Write Speed
437 MB/s Hugely faster peak write speed.
142 MB/s -208%
4K Read
Peak 4K Random Read Speed
35.6 MB/s Faster peak random read.
29.9 MB/s -19%
4K Write
Peak 4K Random Write Speed
112 MB/s Slightly faster peak random write.
105 MB/s -7%
Peak Sequential Mixed IO Speed
472 MB/s Hugely faster peak mixed IO speed.
196 MB/s -141%
4K Mixed
Peak 4K Random Mixed IO Speed
25.1 MB/s Much faster peak random mixed IO.
17.6 MB/s -43%
Market Share
Based on 5,194,955 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.35 % -663% 2.67 % Hugely higher market share.
Value For Money
32 % -13% 36.3 % Slightly better value.
User Rating
UBM User Rating
63 % Slightly more popular.
57 % -11%
Price (score)
$160 -59% $65 Much cheaper.
63 Months -2% 62 Months +2%
DQ Read
Peak 4K-64Thread Read Speed
361 MB/s Hugely faster peak deep queue read.
157 MB/s -130%
DQ Write
Peak 4K-64Thread Write Speed
313 MB/s Hugely faster peak deep queue write.
144 MB/s -117%
AS-SSD Total
AS-SSD Total Score
1,155 Pts Hugely stronger server IO.
616 Pts -88%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
78.3 MB/s Hugely faster peak deep queue mixed IO.
39.2 MB/s -100%
ADQ Read
Avg. 4K-64Thread Read Speed
194 MB/s Hugely faster deep queue read.
66.5 MB/s -192%
ADQ Write
Avg. 4K-64Thread Write Speed
176 MB/s Much faster deep queue write.
103 MB/s -71%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
45.8 MB/s Hugely faster deep queue mixed IO.
21.3 MB/s -115%
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]


The 120GB Kingston V300 has a performance profile that closely matches its 240GB sibling. Both drives utilize a Sandforce LSI controller and therefore demonstrate relative weakness in their write speeds. With burst sequential read/write speeds of 497/166 MBps and 4k burst read/write speeds of 30/97 MBps the 120GB V300 is amongst the slower SSDs I have seen. A concern I have with this drive is the relatively slow real world speeds our users have experienced. Most drives have average throughput rates that are around 75% of peak. Both this and the 240GB V300s, based on 130 samples, are averaging sequential read rates of around 240 MBps which is less than 50% of peak. It's not all bad news though because the V300's are priced extremely aggressively and as a result still offer decent value for money. [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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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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