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AdataASP550SS3-120GM-C
SamsungMZ-7PD256BW
▲ 52341 ▼

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

VS
▲ 5420,555 ▼

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

Effective Speed 
+26%
Real World Speed
Performance profile from 95,176 user samples
Benchmark your SSD here
22,057 User Benchmarks
Best Bench: 91% 78GB free (System drive)
Worst Bench: 51% 62GB free (System drive)
Poor: 51% Great: 91%
SPEED RANK: 564th / 1072
73,119 User Benchmarks
Best Bench: 116% 238GB free
Worst Bench: 68% 11GB free (System drive)
Poor: 68% Great: 116%
SPEED RANK: 279th / 1072
Effective Speed
Effective SSD Speed 		75.6 % 95 % Faster effective speed.
+26%
Average Score 
+39%
Read
Avg. Sequential Read Speed 		460 MB/s +0% 459 MB/s
Write
Avg. Sequential Write Speed 		351 MB/s 367 MB/s +5%
4K Read
Avg. 4K Random Read Speed 		28 MB/s 31 MB/s Faster random read.
+11%
4K Write
Avg. 4K Random Write Speed 		76.6 MB/s 85.6 MB/s Faster random write.
+12%
Mixed
Avg. Sequential Mixed IO Speed 		328 MB/s Slightly faster mixed IO speed.
+8% 		303 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		36.5 MB/s 39.5 MB/s Slightly faster random mixed IO.
+8%
SusWrite
Avg. Sustained Write Speed 		91 MB/s 312 MB/s Hugely faster sustained write speed.
+243%
Peak Score 
+52%
Read
Peak Sequential Read Speed 		510 MB/s 510 MB/s
Write
Peak Sequential Write Speed 		416 MB/s 480 MB/s Faster peak write speed.
+15%
4K Read
Peak 4K Random Read Speed 		39.3 MB/s Slightly faster peak random read.
+9% 		36.1 MB/s
4K Write
Peak 4K Random Write Speed 		114 MB/s 114 MB/s
Mixed
Peak Sequential Mixed IO Speed 		386 MB/s +5% 368 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		49.5 MB/s +4% 47.6 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		102 MB/s 477 MB/s Hugely faster peak sustained write speed.
+368%
Value & Sentiment 
+26%
Market Share
Based on 75,655,244 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.05 % 0.05 %
Value
Value For Money 		10.2 % Much better value.
+33% 		7.72 %
User Rating
UBM User Rating 		52 % 54 % +4%
Price
Price (score) 		$45 Much cheaper.
+76% 		$190
Nice To Haves 
+6%
Age
Newest 		103 Months More recent.
+25% 		138 Months
DQ Read
Peak 4K-64Thread Read Speed 		333 MB/s 385 MB/s Faster peak deep queue read.
+16%
DQ Write
Peak 4K-64Thread Write Speed 		329 MB/s 334 MB/s +2%
AS-SSD Total
AS-SSD Total Score 		1,134 Pts 1,221 Pts Slightly stronger server IO.
+8%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		259 MB/s Much faster peak deep queue mixed IO.
+47% 		176 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		269 MB/s 346 MB/s Faster deep queue read.
+29%
ADQ Write
Avg. 4K-64Thread Write Speed 		251 MB/s 262 MB/s +4%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		196 MB/s Much faster deep queue mixed IO.
+33% 		147 MB/s
Specifications 
Capacity
Capacity 		120GB 256GB
Conclusion 
Average Bench 75.6%
Average Bench 95%
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]

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User Builds 
22,057
73,119
Custom PC Builder (Start a new build) Build your perfect PC: compare component prices, popularity, speed and value for money

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Solid State Drive Rankings (Price vs Performance) April 2024 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]

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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 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 value for money upgrades.

UserBenchmark of the month

Gaming Desktop ProGaming

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

Storage Devices FAQ
What is sustained sequential write speed?
What’s the difference between SLC, MLC and TLC?
What is 3D XPoint and how fast is it?
What’s the difference between SATA, PCIe and NVMe?
What’s the difference between NAND and V-NAND?
What is sequential write speed?
What is sequential read speed?
What is incompressible data?
What is queue depth?
Solid State Drives
What is the SSD value for money rating?
What is 4K 64 thread write speed?
Can CPU power saving states (C1,C2,C3) impact SSD speed?
What is the effective SSD speed index?
How is the AS SSD write score calculated?
How is the AS SSD read score calculated?
How is the AS SSD total score calculated?
ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i5-13600K $279Nvidia RTX 4060 $300Crucial MX500 250GB $40
Intel Core i5-12400F $134Nvidia RTX 4060-Ti $385Samsung 850 Evo 120GB $80
Intel Core i5-12600K $184Nvidia RTX 4070 $409Samsung 860 Evo 250GB $46
HDDRAMUSB
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $40SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $51G.SKILL Trident Z DDR4 3200 C14 4x16GB $351SanDisk Ultra Fit 32GB $16
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