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SamsungMZ-77E4T0B
SamsungMZ-7KE256BW
▲ 5121 ▼

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

VS
▲ 5441,223 ▼

Controller: Samsung Triple Core MEX. Memory: Samsung 40nm MLC V-NAND. Release date: Q3 2014.

Effective Speed 
+14%
Real World Speed
Performance profile from 151,383 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
141,929 User Benchmarks
Best Bench: 124% 238GB free
Worst Bench: 71% 71GB free (System drive)
Poor: 71% Great: 124%
SPEED RANK: 256th / 1080
Effective Speed
Effective SSD Speed 		117 % Faster effective speed.
+14% 		102 %
Average Score 
+16%
Read
Avg. Sequential Read Speed 		481 MB/s +3% 469 MB/s
Write
Avg. Sequential Write Speed 		451 MB/s Faster write speed.
+14% 		396 MB/s
4K Read
Avg. 4K Random Read Speed 		40.5 MB/s Faster random read.
+19% 		33.9 MB/s
4K Write
Avg. 4K Random Write Speed 		90 MB/s +0% 89.6 MB/s
Mixed
Avg. Sequential Mixed IO Speed 		426 MB/s Faster mixed IO speed.
+28% 		334 MB/s
4K Mixed
Avg. 4K Random Mixed IO Speed 		53.6 MB/s Faster random mixed IO.
+22% 		44.1 MB/s
SusWrite
Avg. Sustained Write Speed 		445 MB/s Faster sustained write speed.
+29% 		346 MB/s
Peak Score 
+9%
Read
Peak Sequential Read Speed 		517 MB/s +0% 515 MB/s
Write
Peak Sequential Write Speed 		491 MB/s +1% 488 MB/s
4K Read
Peak 4K Random Read Speed 		48.8 MB/s Faster peak random read.
+12% 		43.6 MB/s
4K Write
Peak 4K Random Write Speed 		131 MB/s +5% 125 MB/s
Mixed
Peak Sequential Mixed IO Speed 		464 MB/s Faster peak mixed IO speed.
+21% 		383 MB/s
4K Mixed
Peak 4K Random Mixed IO Speed 		68.1 MB/s Faster peak random mixed IO.
+20% 		56.7 MB/s
SusWrite
Peak Sequential Sustained Write 60s Average 		489 MB/s +1% 484 MB/s
Value & Sentiment 
+48%
Market Share
Based on 77,611,219 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.05 % 0.09 % Hugely higher market share.
+80%
Value
Value For Money 		54.7 % Hugely better value.
+339% 		12.5 %
User Rating
UBM User Rating 		51 % 54 % Slightly more popular.
+6%
Price
Price (score) 		$287 $110 Much cheaper.
+62%
Nice To Haves 
+12%
Age
Newest 		45+ Months Much more recent.
+64% 		124 Months
DQ Read
Peak 4K-64Thread Read Speed 		389 MB/s +0% 388 MB/s
DQ Write
Peak 4K-64Thread Write Speed 		364 MB/s +1% 361 MB/s
AS-SSD Total
AS-SSD Total Score 		1,301 Pts +2% 1,280 Pts
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		374 MB/s Slightly faster peak deep queue mixed IO.
+5% 		356 MB/s
ADQ Read
Avg. 4K-64Thread Read Speed 		354 MB/s +3% 344 MB/s
ADQ Write
Avg. 4K-64Thread Write Speed 		305 MB/s Slightly faster deep queue write.
+8% 		282 MB/s
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		324 MB/s Slightly faster deep queue mixed IO.
+10% 		295 MB/s
Specifications 
Capacity
Capacity 		4TB 256GB
Conclusion 
Average Bench 117%
Average Bench 102%

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]

MORE DETAILS

The 256GB Samsung 850 Pro is the fastest consumer SSD we have seen to date. Thanks to Samsung's new 3D V-NAND the 850 Pro has lower power consumption and better performance, albeit marginally, than both the 840 Evo and 840 Pro. Looking at the benchmark figures for the 840 and 850 Pros shows that the effective performance improvement is 10% whereas the 850 Pro beats the 840 Evo by 16%. These drives effectively saturate SATA 3.0 making it difficult to distinguish between them in day-to-day use. At current prices the 850 Pro is prohibitively expensive, prices need to drop by 15% before it approaches the 840 Pro from a value perspective. Samsung may release a value orientated 850 Evo soon, but for now "most" users are better off with the 840 Pro. [Oct '14 SSDrivePro]

MORE DETAILS

User Builds 
9,454
141,929
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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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How it works

  • - Download and run UserBenchmark
  • - CPU tests include: integer, floating and string
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  • - SkillBench (space shooter) tests user input accuracy
  • - Reports are generated and presented on userbenchmark.com
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  • - 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 »

 Best User Rated
Why does UserBenchmark have a bad reputation on reddit?
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 200+ trustpilot reviews are mostly written by virgin marketing accounts. Real users don't give a monkey's about big brands.
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Instead of pursuing brands for sponsorship, we've spent 13 years publishing real-world data for users.
The Best
CPUGPUSSD
Intel Core i5-13600K $210Nvidia RTX 4060 $285WD Black SN850X M.2 2TB $125
Intel Core i5-12600K $154Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $80
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $320
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