Controller: Indilinx Barefoot 3 IDX500M00. Flash: Toshiba A19nm MLC.

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

Real World Speed
Performance profile from 12,616 user samples
557 User Benchmarks
Best Bench: 101% 98GB free
Worst Bench: 64% 80GB free
Poor: 64% Great: 101%
SPEED RANK: 145th / 873
12,059 User Benchmarks
Best Bench: 98% 29GB free
Worst Bench: 53% 5GB free
Poor: 53% Great: 98%
SPEED RANK: 226th / 873
Effective Speed
Effective SSD Speed
84.1 % Slightly faster effective speed.
78.3 % -7%
Avg. Sequential Read Speed
494 MB/s +2% 485 MB/s -2%
Avg. Sequential Write Speed
414 MB/s Much faster write speed.
297 MB/s -39%
4K Read
Avg. 4K Random Read Speed
24.4 MB/s -18% 28.7 MB/s Faster random read.
4K Write
Avg. 4K Random Write Speed
88.5 MB/s Slightly faster random write.
78.1 MB/s -13%
Avg. Sequential Mixed IO Speed
434 MB/s Much faster mixed IO speed.
325 MB/s -34%
4K Mixed
Avg. 4K Random Mixed IO Speed
17.4 MB/s -16% 20.1 MB/s Faster random mixed IO.
Peak Sequential Read Speed
521 MB/s 0% 521 MB/s 0%
Peak Sequential Write Speed
434 MB/s -1% 437 MB/s +1%
4K Read
Peak 4K Random Read Speed
29.6 MB/s -20% 35.6 MB/s Faster peak random read.
4K Write
Peak 4K Random Write Speed
130 MB/s Faster peak random write.
112 MB/s -16%
Peak Sequential Mixed IO Speed
459 MB/s -3% 472 MB/s +3%
4K Mixed
Peak 4K Random Mixed IO Speed
24.5 MB/s -2% 25.1 MB/s +2%
Market Share
Based on 5,201,195 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.02 % -1,650% 0.35 % Insanely higher market share.
Value For Money
62.9 % Hugely better value.
32 % -97%
User Rating
UBM User Rating
62 % -2% 63 % +2%
Price (score)
$67 Much cheaper.
$160 -58%
41 Months Much more recent.
63 Months -35%
DQ Read
Peak 4K-64Thread Read Speed
335 MB/s -8% 361 MB/s Slightly faster peak deep queue read.
DQ Write
Peak 4K-64Thread Write Speed
352 MB/s Slightly faster peak deep queue write.
313 MB/s -12%
AS-SSD Total
AS-SSD Total Score
1,161 Pts +0% 1,155 Pts -0%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
81.3 MB/s +4% 78.3 MB/s -4%
ADQ Read
Avg. 4K-64Thread Read Speed
152 MB/s -28% 194 MB/s Faster deep queue read.
ADQ Write
Avg. 4K-64Thread Write Speed
213 MB/s Faster deep queue write.
176 MB/s -21%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
44.7 MB/s -2% 45.8 MB/s +2%
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 userbenchmark.com.
  • - 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 $280Nvidia GTX 1070 $430Samsung 850 Evo 250GB $87
AMD Ryzen 7 1700 $270Nvidia 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
Today's hottest deals
User Guide  •  About  •  FAQs  •  Email  •  Privacy  •  Developer Feedback