Real World Speed
Performance profile from 13,020 user samples
13,020 User Benchmarks
Best Bench: 99% 79GB free
Worst Bench: 56% 19GB free
Poor: 56% Great: 99%
SPEED RANK: 229th / 885
Effective Speed
Effective SSD Speed
79 % +4% 75.8 %
Avg. Sequential Read Speed
487 MB/s +5% 465 MB/s
Avg. Sequential Write Speed
298 MB/s +2% 294 MB/s
4K Read
Avg. 4K Random Read Speed
29.1 MB/s +3% 28.3 MB/s
4K Write
Avg. 4K Random Write Speed
78.8 MB/s +4% 75.8 MB/s
Avg. Sequential Mixed IO Speed
326 MB/s +2% 319 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed
20.2 MB/s +1% 20 MB/s
Peak Sequential Read Speed
521 MB/s +4% 501 MB/s
Peak Sequential Write Speed
438 MB/s Faster peak write speed.
342 MB/s
4K Read
Peak 4K Random Read Speed
36 MB/s +0% 35.9 MB/s
4K Write
Peak 4K Random Write Speed
112 MB/s +2% 110 MB/s
Peak Sequential Mixed IO Speed
474 MB/s Faster peak mixed IO speed.
371 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed
25.2 MB/s 27.3 MB/s Slightly faster peak random mixed IO.
Market Share
Based on 5,673,090 SSDs tested.
User Rating
UBM User Rating
63 % 63.2 % +0%
Market Share
Market Share (trailing 30 days)
0.28 % 0.38 % Much higher market share.
Price (score)
$160 117 USD Much cheaper.
Value For Money
32.3 % 40.8 % Better value.
DQ Read
Peak 4K-64Thread Read Speed
362 MB/s Faster peak deep queue read.
305 MB/s
DQ Write
Peak 4K-64Thread Write Speed
310 MB/s Faster peak deep queue write.
262 MB/s
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
79.1 MB/s +2% 77.3 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed
201 MB/s Faster deep queue read.
160 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed
182 MB/s Slightly faster deep queue write.
168 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
47.1 MB/s +3% 45.6 MB/s
64 Months 51.2 Months More recent.
AS-SSD Total
AS-SSD Total Score
1,155 Pts Stronger server IO.
1,003 Pts
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) February 2018 SSD Rankings.

Welcome to our 2.5" and M.2 SSD comparison. We calculate effective speed for both SATA and NVMe drives based on real world performance then adjust by current prices per GB to yield a value for money rating. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top SSDs. [SSDrivePro]


Group Test Results

  • Best user rated - Sometimes benchmarks get it completely wrong...
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance, price and capacity.
  • Raw speed comparison - Raw speed readings.
  • Details ordered by value - Detailed performance stats ordered by overall value for money.
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 i7-8700K $330Nvidia GTX 1070 $430Samsung 850 Evo 250GB $88
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $285Samsung 850 Evo 500GB $149
AMD Ryzen 5 1600 $170AMD RX 480 $400Samsung 850 Pro 256GB $146
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $192SanDisk Extreme 64GB $50
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $975SanDisk Extreme 32GB $23
Seagate Barracuda 2TB (2016) $60Corsair Vengeance LPX DDR4 3200 C16 2x8GB $206SanDisk Extreme 16GB $18
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