SamsungMZ-7PD256BW
SamsungMZ-7KE256BW

Controller: Samsung 3-core MDX. Flash Memory: Samsung 21nm Toggle Mode MLC.

Controller: Samsung Triple Core MEX. Memory: Samsung 40nm MLC V-NAND

Real World Speed
Performance profile from 35,065 user samples
14,224 User Benchmarks
Best Bench: 106% 205GB free
Worst Bench: 53% 7GB free
Poor: 53% Great: 106%
SPEED RANK: 156th / 853
20,841 User Benchmarks
Best Bench: 123% 149GB free
Worst Bench: 70% 107GB free
Poor: 70% Great: 123%
SPEED RANK: 57th / 853
Effective Speed
Effective SSD Speed
82.5 % -20% 99.1 % Faster effective speed.
+20%
Read
Avg. Sequential Read Speed
489 MB/s -3% 505 MB/s +3%
Write
Avg. Sequential Write Speed
343 MB/s -29% 442 MB/s Faster write speed.
+29%
4K Read
Avg. 4K Random Read Speed
29.1 MB/s -12% 32.7 MB/s Slightly faster random read.
+12%
4K Write
Avg. 4K Random Write Speed
77.6 MB/s -16% 89.8 MB/s Faster random write.
+16%
Mixed
Avg. Sequential Mixed IO Speed
379 MB/s -22% 462 MB/s Faster mixed IO speed.
+22%
4K Mixed
Avg. 4K Random Mixed IO Speed
21.8 MB/s -51% 32.9 MB/s Much faster random mixed IO.
+51%
Read
Peak Sequential Read Speed
523 MB/s -1% 529 MB/s +1%
Write
Peak Sequential Write Speed
491 MB/s -2% 502 MB/s +2%
4K Read
Peak 4K Random Read Speed
36.3 MB/s -16% 42 MB/s Faster peak random read.
+16%
4K Write
Peak 4K Random Write Speed
116 MB/s -9% 127 MB/s Slightly faster peak random write.
+9%
Mixed
Peak Sequential Mixed IO Speed
508 MB/s -1% 513 MB/s +1%
4K Mixed
Peak 4K Random Mixed IO Speed
28.6 MB/s -76% 50.4 MB/s Much faster peak random mixed IO.
+76%
Market Share
Based on 3,088,444 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.72 % -69% 1.22 % Much higher market share.
+69%
Value
Value For Money
38.5 % -107% 79.6 % Hugely better value.
+107%
User Rating
UBM User Rating
63 % -54% 97 % Much more popular.
+54%
Price
Price (score)
$268 -51% $130 Much cheaper.
+51%
Age
Newest
56 Months -38% 35 Months Much more recent.
+38%
DQ Read
Peak 4K-64Thread Read Speed
369 MB/s -4% 382 MB/s +4%
DQ Write
Peak 4K-64Thread Write Speed
318 MB/s -8% 342 MB/s Slightly faster peak deep queue write.
+8%
AS-SSD Total
AS-SSD Total Score
1,186 Pts -6% 1,254 Pts Slightly stronger server IO.
+6%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
89.6 MB/s -84% 165 MB/s Hugely faster peak deep queue mixed IO.
+84%
ADQ Read
Avg. 4K-64Thread Read Speed
197 MB/s -6% 208 MB/s Slightly faster deep queue read.
+6%
ADQ Write
Avg. 4K-64Thread Write Speed
186 MB/s -26% 234 MB/s Faster deep queue write.
+26%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
54.1 MB/s -62% 87.7 MB/s Much faster deep queue mixed IO.
+62%
Capacity
Capacity
256GB 256GB
ADVERTISEMENT

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]

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

Solid State Drive Rankings (Price vs Performance) June 2017 SSD Rankings.

Welcome to our consumer SSD comparison. We calculate effective speed based on real world performance then adjust by cost per GB to yield a value for money rating. Calculated values don't always tell the whole picture so we check them against thousands of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top SSDs. Share your opinion by voting. [SSDrivePro]

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware 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 upgrades.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - 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 highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.

 Frequently Asked Questions

 Best User Rated

The Best.
CPUGPUSSD
Intel Core i7-7700K $307Nvidia GTX 1070 $390Samsung 850 Evo 250GB $100
AMD Ryzen 7 1700 $278AMD RX 480 $608Samsung 850 Pro 256GB $130
Intel Core i5-7600K $225Nvidia GTX 1060-6GB $239Samsung 850 Evo 500GB $160
HDDRAMUSB
Seagate Barracuda 1TB (2016) $42Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $45
Seagate Barracuda 3TB (2016) $83G.SKILL Trident Z DDR4 3200 C14 4x16GB $696SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46HyperX Fury DDR4 2133 C14 2x8GB $133SanDisk Ultra Fit 32GB $13
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