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SamsungMZ-7PD128BW
SamsungMZ-7KE256BW
▲ 542,763 ▼

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

VS
▲ 5441,222 ▼

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

Effective Speed 
+14%
Real World Speed
Performance profile from 176,771 user samples
Benchmark your SSD here
34,842 User Benchmarks
Best Bench: 110% 62GB free
Worst Bench: 62% 119GB free
Poor: 62% Great: 110%
SPEED RANK: 336th / 1072
141,929 User Benchmarks
Best Bench: 124% 238GB free
Worst Bench: 71% 71GB free (System drive)
Poor: 71% Great: 124%
SPEED RANK: 248th / 1072
Effective Speed
Effective SSD Speed 		89.5 % 102 % Faster effective speed.
+14%
Average Score 
+16%
Read
Avg. Sequential Read Speed 		444 MB/s 469 MB/s Slightly faster read speed.
+6%
Write
Avg. Sequential Write Speed 		336 MB/s 396 MB/s Faster write speed.
+18%
4K Read
Avg. 4K Random Read Speed 		30.5 MB/s 33.9 MB/s Faster random read.
+11%
4K Write
Avg. 4K Random Write Speed 		81.6 MB/s 89.6 MB/s Slightly faster random write.
+10%
Mixed
Avg. Sequential Mixed IO Speed 		268 MB/s 334 MB/s Faster mixed IO speed.
+25%
4K Mixed
Avg. 4K Random Mixed IO Speed 		35.9 MB/s 44.1 MB/s Faster random mixed IO.
+23%
SusWrite
Avg. Sustained Write Speed 		286 MB/s 346 MB/s Faster sustained write speed.
+21%
Peak Score 
+14%
Read
Peak Sequential Read Speed 		497 MB/s 515 MB/s +4%
Write
Peak Sequential Write Speed 		445 MB/s 488 MB/s Slightly faster peak write speed.
+10%
4K Read
Peak 4K Random Read Speed 		36.3 MB/s 43.6 MB/s Faster peak random read.
+20%
4K Write
Peak 4K Random Write Speed 		113 MB/s 125 MB/s Faster peak random write.
+11%
Mixed
Peak Sequential Mixed IO Speed 		331 MB/s 383 MB/s Faster peak mixed IO speed.
+16%
4K Mixed
Peak 4K Random Mixed IO Speed 		44.1 MB/s 56.7 MB/s Faster peak random mixed IO.
+29%
SusWrite
Peak Sequential Sustained Write 60s Average 		440 MB/s 484 MB/s Slightly faster peak sustained write speed.
+10%
Value & Sentiment 
+214%
Market Share
Based on 75,655,775 SSDs tested
See market share leaders
Market Share
Market Share (trailing 30 days) 		0.01 % 0.08 % Hugely higher market share.
+700%
Value
Value For Money 		5.17 % 12.1 % Hugely better value.
+133%
User Rating
UBM User Rating 		54 % 54 %
Price
Price (score) 		$150 $115 Cheaper.
+23%
Nice To Haves 
+40%
Age
Newest 		138 Months 117 Months More recent.
+15%
DQ Read
Peak 4K-64Thread Read Speed 		376 MB/s 388 MB/s +3%
DQ Write
Peak 4K-64Thread Write Speed 		330 MB/s 361 MB/s Slightly faster peak deep queue write.
+9%
AS-SSD Total
AS-SSD Total Score 		1,196 Pts 1,280 Pts Slightly stronger server IO.
+7%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed 		155 MB/s 356 MB/s Hugely faster peak deep queue mixed IO.
+130%
ADQ Read
Avg. 4K-64Thread Read Speed 		332 MB/s 344 MB/s +4%
ADQ Write
Avg. 4K-64Thread Write Speed 		245 MB/s 282 MB/s Faster deep queue write.
+15%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed 		126 MB/s 295 MB/s Hugely faster deep queue mixed IO.
+134%
Specifications 
Capacity
Capacity 		128GB 256GB
Conclusion 
Average Bench 89.5%
Average Bench 102%
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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]

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

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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

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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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