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 34,288 user samples
12,914 User Benchmarks
Best Bench: 107% 218GB free
Worst Bench: 56% 1GB free
Poor: 56% Great: 107%
SPEED RANK: 140th / 850
21,374 User Benchmarks
Best Bench: 123% 214GB free
Worst Bench: 66% 28GB free
Poor: 66% Great: 123%
SPEED RANK: 53rd / 850
Effective Speed
Effective SSD Speed
83.4 % -19% 98.8 % Faster effective speed.
+19%
Read
Avg. Sequential Read Speed
490 MB/s -3% 503 MB/s +3%
Write
Avg. Sequential Write Speed
352 MB/s -25% 440 MB/s Faster write speed.
+25%
4K Read
Avg. 4K Random Read Speed
28.9 MB/s -12% 32.3 MB/s Slightly faster random read.
+12%
4K Write
Avg. 4K Random Write Speed
78.8 MB/s -11% 87.4 MB/s Slightly faster random write.
+11%
Mixed
Avg. Sequential Mixed IO Speed
383 MB/s -20% 459 MB/s Faster mixed IO speed.
+20%
4K Mixed
Avg. 4K Random Mixed IO Speed
22.3 MB/s -54% 34.4 MB/s Much faster random mixed IO.
+54%
Read
Peak Sequential Read Speed
524 MB/s -1% 529 MB/s +1%
Write
Peak Sequential Write Speed
495 MB/s -1% 502 MB/s +1%
4K Read
Peak 4K Random Read Speed
36.6 MB/s -14% 41.7 MB/s Slightly faster peak random read.
+14%
4K Write
Peak 4K Random Write Speed
118 MB/s -8% 128 MB/s Slightly faster peak random write.
+8%
Mixed
Peak Sequential Mixed IO Speed
508 MB/s -1% 514 MB/s +1%
4K Mixed
Peak 4K Random Mixed IO Speed
29.3 MB/s -75% 51.3 MB/s Much faster peak random mixed IO.
+75%
Market Share
Based on 2,813,985 SSDs tested.
Market Share
Market Share (trailing 30 days)
0.87 % -66% 1.44 % Much higher market share.
+66%
Value
Value For Money
44.5 % -70% 75.9 % Much better value.
+70%
User Rating
UBM User Rating
64 % -50% 96 % Much more popular.
+50%
Price
Price (score)
$224 -38% $138 Much cheaper.
+38%
Age
Newest
55 Months -38% 34 Months Much more recent.
+38%
DQ Read
Peak 4K-64Thread Read Speed
375 MB/s -2% 383 MB/s +2%
DQ Write
Peak 4K-64Thread Write Speed
322 MB/s -7% 345 MB/s Slightly faster peak deep queue write.
+7%
AS-SSD Total
AS-SSD Total Score
1,202 Pts -5% 1,259 Pts +5%
DQ Mixed
Peak 4K-64Thread Mixed IO Speed
90.7 MB/s -83% 166 MB/s Hugely faster peak deep queue mixed IO.
+83%
ADQ Read
Avg. 4K-64Thread Read Speed
194 MB/s -7% 207 MB/s Slightly faster deep queue read.
+7%
ADQ Write
Avg. 4K-64Thread Write Speed
188 MB/s -16% 219 MB/s Faster deep queue write.
+16%
ADQ Mixed
Avg. 4K-64Thread Mixed IO Speed
53.2 MB/s -69% 89.9 MB/s Much faster deep queue mixed IO.
+69%
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) May 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 $309Nvidia GTX 1070 $368Samsung 850 Evo 250GB $98
AMD Ryzen 7 1700 $300AMD RX 480 $210Samsung 850 Pro 256GB $138
Intel Core i5-7600K $240Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $167
HDDRAMUSB
Seagate Barracuda 1TB (2016) $50Corsair Vengeance LPX DDR4 3000 C15 2x8GB $127SanDisk Extreme 64GB $33
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $700SanDisk Extreme 32GB $22
Seagate Barracuda 7200.14 1TB $46Corsair Vengeance LPX DDR4 3200 C16 2x8GB $130SanDisk Ultra Fit 32GB $13
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