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AdataASP900S3-256GM-C
SamsungMZ-7PD256BW
▲ 505 ▼

Controller: LSI SandForce SF2281. NAND Flash: Intel Micron Synchronous 25nm MLC. Release date ≤ Q1 2014.

VS
▲ 5420,557 ▼

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

Effective Speed 
+28%
Real World Speed
Performance profile from 82,549 user samples
Benchmark your SSD here
9,430 User Benchmarks
Best Bench: 89% 187GB free
Worst Bench: 53% 6GB free
Poor: 53% Great: 89%
SPEED RANK: 604th / 1080
73,119 User Benchmarks
Best Bench: 116% 238GB free
Worst Bench: 68% 11GB free (System drive)
Poor: 68% Great: 116%
SPEED RANK: 287th / 1080
Effective Speed
Effective SSD Speed 		74 % 95 % Faster effective speed.
+28%
Average Score 
+29%
Read
Avg. Sequential Read Speed 		353 MB/s 459 MB/s Much faster read speed.
+30%
Write
Avg. Sequential Write Speed 		248 MB/s 367 MB/s Much faster write speed.
+48%
4K Read
Avg. 4K Random Read Speed 		27.2 MB/s 31 MB/s Faster random read.
+14%
4K Write
Avg. 4K Random Write Speed 		80.3 MB/s 85.6 MB/s Slightly faster random write.
+7%
Mixed
Avg. Sequential Mixed IO Speed 		264 MB/s 303 MB/s Faster mixed IO speed.
+15%
4K Mixed
Avg. 4K Random Mixed IO Speed 		34.9 MB/s 39.5 MB/s Faster random mixed IO.
+13%
SusWrite
Avg. Sustained Write Speed 		177 MB/s 312 MB/s Much faster sustained write speed.
+76%
Peak Score 
+32%
Read
Peak Sequential Read Speed 		419 MB/s 510 MB/s Faster peak read speed.
+22%
Write
Peak Sequential Write Speed 		303 MB/s 480 MB/s Much faster peak write speed.
+58%
4K Read
Peak 4K Random Read Speed 		33.9 MB/s 36.1 MB/s Slightly faster peak random read.
+6%
4K Write
Peak 4K Random Write Speed 		111 MB/s 114 MB/s +3%
Mixed
Peak Sequential Mixed IO Speed 		299 MB/s 368 MB/s Faster peak mixed IO speed.
+23%
4K Mixed
Peak 4K Random Mixed IO Speed 		44.1 MB/s 47.6 MB/s Slightly faster peak random mixed IO.
+8%
SusWrite
Peak Sequential Sustained Write 60s Average 		236 MB/s 477 MB/s Hugely faster peak sustained write speed.
+102%
Value & Sentiment 
+135%
Market Share
Based on 77,578,864 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.01 % 0.05 % Hugely higher market share.
+400%
Value
Value For Money 		4.27 % 8.21 % Hugely better value.
+92%
User Rating
UBM User Rating 		50 % 54 % Slightly more popular.
+8%
Price
Price (score) 		$300 $175 Much cheaper.
+42%
Nice To Haves 
+12%
Age
Newest 		129+ Months More recent.
+11% 		145 Months
DQ Read
Peak 4K-64Thread Read Speed 		290 MB/s 385 MB/s Much faster peak deep queue read.
+33%
DQ Write
Peak 4K-64Thread Write Speed 		264 MB/s 334 MB/s Faster peak deep queue write.
+27%
AS-SSD Total
AS-SSD Total Score 		965 Pts 1,221 Pts Stronger server IO.
+26%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		247 MB/s Much faster peak deep queue mixed IO.
+40% 		176 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		213 MB/s 346 MB/s Much faster deep queue read.
+62%
ADQ Write
Avg. 4K-64Thread Write Speed 		216 MB/s 262 MB/s Faster deep queue write.
+21%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		176 MB/s Faster deep queue mixed IO.
+20% 		147 MB/s
Specifications 
Capacity
Capacity 		256GB 256GB
Conclusion 
Average Bench 74%
Average Bench 95%

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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Solid State Drive Rankings (Price vs Performance) November 2024 SSD Rankings

Welcome to our 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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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.

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 Frequently Asked Questions

Storage Devices FAQ
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What is 3D XPoint and how fast is it?
What’s the difference between SATA, PCIe and NVMe?
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What is sequential write speed?
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What is incompressible data?
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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?
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Brands make boatloads on flagships like the 4090 and 14900KS. We help users get similar real-world performance for less money.
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We don't pay youtubers, so they don't praise us. Moreover, our data obstructs youtubers who promote overpriced or inferior products.
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