AdataASP550SS3-240GM-C
SamsungMZ-7PD256BW

Controller: Silicon Motion SM2256. Flash Memory: SK Hynix 16nm TLC. Release date: Q3 2015.

Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC. Release date: Q4 2012.

Real World Speed
Performance profile from 91,708 user samples
25,134 User Benchmarks
Best Bench: 93% 63GB free (System drive)
Worst Bench: 58% 223GB free
Poor: 58% Great: 93%
SPEED RANK: 480th / 1058
66,574 User Benchmarks
Best Bench: 115% 144GB free
Worst Bench: 64% 82GB free (System drive)
Poor: 64% Great: 115%
SPEED RANK: 277th / 1058
Effective Speed
Effective SSD Speed
79.7 % 93.3 % Faster effective speed.
+17%
Read
Avg. Sequential Read Speed
468 MB/s +2% 461 MB/s
Write
Avg. Sequential Write Speed
353 MB/s 367 MB/s +4%
4K Read
Avg. 4K Random Read Speed
29.2 MB/s 30.8 MB/s Slightly faster random read.
+5%
4K Write
Avg. 4K Random Write Speed
80.3 MB/s 81.3 MB/s +1%
Mixed
Avg. Sequential Mixed IO Speed
348 MB/s Faster mixed IO speed.
+16%
299 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed
40.4 MB/s +4% 38.7 MB/s
SusWrite
Avg. Sustained Write Speed
91 MB/s 312 MB/s Hugely faster sustained write speed.
+243%
Read
Peak Sequential Read Speed
508 MB/s 509 MB/s +0%
Write
Peak Sequential Write Speed
455 MB/s 482 MB/s Slightly faster peak write speed.
+6%
4K Read
Peak 4K Random Read Speed
34.7 MB/s 36.1 MB/s +4%
4K Write
Peak 4K Random Write Speed
111 MB/s 113 MB/s +2%
Mixed
Peak Sequential Mixed IO Speed
406 MB/s Faster peak mixed IO speed.
+13%
359 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed
50 MB/s Slightly faster peak random mixed IO.
+6%
47.3 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average
117 MB/s 476 MB/s Hugely faster peak sustained write speed.
+307%
Market Share
Based on 45,319,298 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.05 % 0.09 % Hugely higher market share.
+80%
Value
Value For Money
12.5 % Much better value.
+77%
7.06 %
User Rating
UBM User Rating
53 % 54 % +2%
Price
Price (score)
$74 Much cheaper.
+65%
$209
Age
Newest
70 Months Much more recent.
+33%
105 Months
DQ Read
Peak 4K-64Thread Read Speed
337 MB/s 385 MB/s Faster peak deep queue read.
+14%
DQ Write
Peak 4K-64Thread Write Speed
342 MB/s +3% 333 MB/s
AS-SSD Total
AS-SSD Total Score
1,147 Pts 1,219 Pts Slightly stronger server IO.
+6%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
254 MB/s Much faster peak deep queue mixed IO.
+45%
175 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed
288 MB/s 333 MB/s Faster deep queue read.
+16%
ADQ Write
Avg. 4K-64Thread Write Speed
267 MB/s Slightly faster deep queue write.
+8%
248 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
211 MB/s Much faster deep queue mixed IO.
+50%
141 MB/s
Capacity
Capacity
240GB 256GB
ADVERTISEMENT

The 840 Pro is stunning. Samsung have created a completely in-house package including both the controller and their own new 21nm toggle mode NAND. On release (Oct '12) this was the fastest performing deep queue depth consumer grade SSD available. Fast forward six months (Apr '13) and the 840 Pro still holds both the random read/write deep queue depth speed records of 384 MB/s and 326 MB/s, impressive considering how fast the SSD space tends to move. There are no obvious weaknesses, in-fact the 840 pro takes first place in nearly all of the speed categories and is only seriously rivalled by one drive, the OCZ Vector. To conclude, in terms of both outright performance, particularly server orientated, and value for money the 256GB and 128GB 840 Pros are amongst the top handful of drives currently available. [Jun '13 SSDrivePro]

MORE DETAILS

Solid State Drive Rankings (Price vs Performance) July 2021 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]

ADVERTISEMENT

Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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.
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - SkillBench (space shooter) tests user input accuracy.
  • - 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 current market leaders.
  • - Explore your best upgrade options with a virtual PC build.
  • - Compare your in-game FPS to other users with your hardware.

 Frequently Asked Questions

 Best User Rated

The Best.
CPUGPUSSD
Intel Core i5-11400F $268Nvidia RTX 3060-Ti $400Crucial MX500 250GB $45
Intel Core i5-11600K $270Nvidia RTX 3070 $500Samsung 860 Evo 250GB $52
Intel Core i7-10700K $304Nvidia GTX 1660S (Super) $240Samsung 850 Evo 120GB $78
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $29Corsair Vengeance LPX DDR4 3000 C15 2x8GB $95SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
Today's hottest deals
About  •  User Guide  •  FAQs  •  Email  •  Privacy  •  Developer  •  YouTube Feedback