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AdataASP900S3-256GM-C
SamsungMZ-7PD128BW
▲ 505 ▼

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

VS
▲ 542,764 ▼

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

Effective Speed 
+21%
Real World Speed
Performance profile from 44,272 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
34,842 User Benchmarks
Best Bench: 110% 62GB free
Worst Bench: 62% 119GB free
Poor: 62% Great: 110%
SPEED RANK: 344th / 1080
Effective Speed
Effective SSD Speed 		74 % 89.5 % Faster effective speed.
+21%
Average Score 
+20%
Read
Avg. Sequential Read Speed 		353 MB/s 444 MB/s Faster read speed.
+26%
Write
Avg. Sequential Write Speed 		248 MB/s 336 MB/s Much faster write speed.
+35%
4K Read
Avg. 4K Random Read Speed 		27.2 MB/s 30.5 MB/s Faster random read.
+12%
4K Write
Avg. 4K Random Write Speed 		80.3 MB/s 81.6 MB/s +2%
Mixed
Avg. Sequential Mixed IO Speed 		264 MB/s 268 MB/s +2%
4K Mixed
Avg. 4K Random Mixed IO Speed 		34.9 MB/s 35.9 MB/s +3%
SusWrite
Avg. Sustained Write Speed 		177 MB/s 286 MB/s Much faster sustained write speed.
+62%
Peak Score 
+25%
Read
Peak Sequential Read Speed 		419 MB/s 497 MB/s Faster peak read speed.
+19%
Write
Peak Sequential Write Speed 		303 MB/s 445 MB/s Much faster peak write speed.
+47%
4K Read
Peak 4K Random Read Speed 		33.9 MB/s 36.3 MB/s Slightly faster peak random read.
+7%
4K Write
Peak 4K Random Write Speed 		111 MB/s 113 MB/s +2%
Mixed
Peak Sequential Mixed IO Speed 		299 MB/s 331 MB/s Faster peak mixed IO speed.
+11%
4K Mixed
Peak 4K Random Mixed IO Speed 		44.1 MB/s 44.1 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		236 MB/s 440 MB/s Hugely faster peak sustained write speed.
+86%
Value & Sentiment 
+145%
Market Share
Based on 77,578,169 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.01 % 0.06 % Hugely higher market share.
+500%
Value
Value For Money 		4.27 % 5.17 % Better value.
+21%
User Rating
UBM User Rating 		50 % 54 % Slightly more popular.
+8%
Price
Price (score) 		$300 $150 Much cheaper.
+50%
Nice To Haves 
+5%
Age
Newest 		129+ Months More recent.
+11% 		145 Months
DQ Read
Peak 4K-64Thread Read Speed 		290 MB/s 376 MB/s Faster peak deep queue read.
+30%
DQ Write
Peak 4K-64Thread Write Speed 		264 MB/s 330 MB/s Faster peak deep queue write.
+25%
AS-SSD Total
AS-SSD Total Score 		965 Pts 1,196 Pts Stronger server IO.
+24%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		247 MB/s Much faster peak deep queue mixed IO.
+59% 		155 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		213 MB/s 332 MB/s Much faster deep queue read.
+56%
ADQ Write
Avg. 4K-64Thread Write Speed 		216 MB/s 245 MB/s Faster deep queue write.
+13%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		176 MB/s Much faster deep queue mixed IO.
+40% 		126 MB/s
Specifications 
Capacity
Capacity 		256GB 128GB
Conclusion 
Average Bench 74%
Average Bench 89.5%

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]

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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]

Group Test Results

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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
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 »

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Marketers operate thousands of reddit accounts. Our benchmarks expose their spiel so they attack our reputation.
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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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