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SamsungMZ-77E4T0B
AdataASP900S3-256GM-C
▲ 5121 ▼

Controller: Samsung MKX. Memory: Samsung 128 layer TLC V-NAND. Release date ≈ Q1 2021.

VS
▲ 505 ▼

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

Effective Speed 
+57%
Real World Speed
Performance profile from 18,884 user samples
Benchmark your SSD here
9,454 User Benchmarks
Best Bench: 137% 3.5TB free
Worst Bench: 90% 1.5TB free
Poor: 90% Great: 137%
SPEED RANK: 203rd / 1080
9,430 User Benchmarks
Best Bench: 89% 187GB free
Worst Bench: 53% 6GB free
Poor: 53% Great: 89%
SPEED RANK: 604th / 1080
Effective Speed
Effective SSD Speed 		117 % Much faster effective speed.
+57% 		74 %
Average Score 
+64%
Read
Avg. Sequential Read Speed 		481 MB/s Much faster read speed.
+36% 		353 MB/s
Write
Avg. Sequential Write Speed 		451 MB/s Hugely faster write speed.
+82% 		248 MB/s
4K Read
Avg. 4K Random Read Speed 		40.5 MB/s Much faster random read.
+49% 		27.2 MB/s
4K Write
Avg. 4K Random Write Speed 		90 MB/s Faster random write.
+12% 		80.3 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		426 MB/s Much faster mixed IO speed.
+61% 		264 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		53.6 MB/s Much faster random mixed IO.
+54% 		34.9 MB/s
SusWrite
Avg. Sustained Write Speed 		445 MB/s Hugely faster sustained write speed.
+151% 		177 MB/s
Peak Score 
+52%
Read
Peak Sequential Read Speed 		517 MB/s Faster peak read speed.
+23% 		419 MB/s
Write
Peak Sequential Write Speed 		491 MB/s Much faster peak write speed.
+62% 		303 MB/s
4K Read
Peak 4K Random Read Speed 		48.8 MB/s Much faster peak random read.
+44% 		33.9 MB/s
4K Write
Peak 4K Random Write Speed 		131 MB/s Faster peak random write.
+18% 		111 MB/s
Mixed
Peak Sequential Mixed IO Speed 		464 MB/s Much faster peak mixed IO speed.
+55% 		299 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		68.1 MB/s Much faster peak random mixed IO.
+54% 		44.1 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		489 MB/s Hugely faster peak sustained write speed.
+107% 		236 MB/s
Value & Sentiment 
+425%
Market Share
Based on 77,580,897 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.06 % Hugely higher market share.
+500% 		0.01 %
Value
Value For Money 		55.2 % Insanely better value.
+1,193% 		4.27 %
User Rating
UBM User Rating 		51 % +2% 50 %
Price
Price (score) 		$283 Slightly cheaper.
+6% 		$300
Nice To Haves 
+52%
Age
Newest 		45+ Months Much more recent.
+65% 		129+ Months
DQ Read
Peak 4K-64Thread Read Speed 		389 MB/s Much faster peak deep queue read.
+34% 		290 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		364 MB/s Much faster peak deep queue write.
+38% 		264 MB/s
AS-SSD Total
AS-SSD Total Score 		1,301 Pts Much stronger server IO.
+35% 		965 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		374 MB/s Much faster peak deep queue mixed IO.
+51% 		247 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		354 MB/s Much faster deep queue read.
+66% 		213 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		305 MB/s Much faster deep queue write.
+41% 		216 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		324 MB/s Hugely faster deep queue mixed IO.
+84% 		176 MB/s
Specifications 
Capacity
Capacity 		4TB 256GB
Conclusion 
Average Bench 117%
Average Bench 74%

There are high failure rates for the 4TB version of this drive. After moderate use the drive can develop bad sectors which block file reads. Scandisk does not detect the errors and the data blocks are not recoverable. There are widespread reports of this problem but Samsung have yet to issue a statement. [Jul '23 SSDrivePro]

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User Builds 
9,454
9,430
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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

  • 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.

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  • - 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
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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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The Best
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Intel Core i5-12600K $165Nvidia RTX 4060 $280WD Black SN850X M.2 2TB $129
Intel Core i5-13600K $210Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $80
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $389
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