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Samsung MZ-7PD256BW

840 Pro 256GB

▲ 5420,552 ▼

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

Average Bench: 92.3% (290th of 1058)

Based on 60,972 user benchmarks.  Models: Samsung SSD 840 PRO Series, Samsung SSD 840, Samsung SSD 840 PRO Seri, Samsung SSD 840 PRO

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]

Poor: 64%Average: 92.3% Great: 116%

Popular builds with this SSD

Excellent average bench

The Samsung 840 Pro 256GB averaged just 7.7% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Samsung 840 Pro 256GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 141MB/s
Avg. 4K Random Mixed IO Speed 37.9MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 52%. This is a relatively wide range which indicates that the Samsung 840 Pro 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sequential Mixed IO Speed 297MB/s
Avg. Sustained Write Speed 306MB/s
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Average Bench

(Based on 60,972 samples)
Rank 29092.3%
Min Avg Max
356 Read 463 509
134 Write 369 482
208 Mixed 297 362
92 SusWrite 306 472
80.4% 359 MB/s
Min Avg Max
21.4 4K Read 30.3 36.1
41.2 4K Write 78.7 112
25.7 4K Mixed 37.9 47
136% 49 MB/s
Min Avg Max
201 DQ Read 333 385
110 DQ Write 252 332
94.5 DQ Mixed 141 175
147% 242 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
59GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 485 487 485 485 486 486 MB/s
115% Outstanding
Read 508
Write 467
Mixed 350
SusWrite 486
102% 452 MB/s
4K Read 35.7
4K Write 92.2
4K Mixed 44.3
160% 57.4 MB/s
DQ Read 381
DQ Write 310
DQ Mixed 175
177% 289 MB/s
52GB free (System drive)
Firmware: 6B0Q
SusWrite @10s intervals: 182 173 172 175 171 164 MB/s
92.6% Outstanding
Read 479
Write 282
Mixed 247
SusWrite 173
66% 295 MB/s
4K Read 35.3
4K Write 99.7
4K Mixed 42.8
161% 59.3 MB/s
DQ Read 381
DQ Write 225
DQ Mixed 138
147% 248 MB/s
135GB free (System drive)
Firmware: DXM04B0Q
SusWrite @10s intervals: 349 351 351 345 346 333 MB/s
79.4% Very good
Read 444
Write 394
Mixed 277
SusWrite 346
82% 365 MB/s
4K Read 19.3
4K Write 38.2
4K Mixed 25
82% 27.5 MB/s
DQ Read 380
DQ Write 302
DQ Mixed 123
151% 268 MB/s
209GB free (System drive)
Firmware: DXM03B0Q
SusWrite @10s intervals: 219 286 301 286 246 271 MB/s
65.6% Good
Read 354
Write 317
Mixed 203
SusWrite 268
64% 285 MB/s
4K Read 23.5
4K Write 57.9
4K Mixed 29.9
105% 37.1 MB/s
DQ Read 28.6
DQ Write 87.4
DQ Mixed 38.8
35% 51.6 MB/s
60,972 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 44,171,647 SSDs tested.

 Prices

MSRP ≈ $203 @ launch in Oct '12
EbayUS $20919 mins
AmazonUS $27112 months
Send price feedback
Custom PC Builder (Start a new build) Build your perfect PC: compare component prices, popularity, speed and value for money.

CHOOSE A COMPONENT:

CPU GPU SSD HDD RAM MBD
Typical 840 Pro 256GB Builds (Compare 3,938 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 65%
Battle cruiser
Desktop
Desktop 83%
Aircraft carrier
Workstation
Workstation 55%
Yacht

Motherboard: Asus MAXIMUS VI HERO - $190

CPU
Core i7-4770KIntel  $300Bench 78%, 137,629 samples1,843x
Core i5-4670KIntel  $400Bench 77%, 130,169 samples720x
Core i7-4790KIntel  $348Bench 83%, 316,893 samples502x
GPU
GTX 1070Nvidia  $400Bench 80%, 1,127,629 samples312x
GTX 970Nvidia  $340Bench 51%, 671,374 samples267x
GTX 770Nvidia  $279Bench 36%, 109,355 samples238x
SSD
840 Pro 256GBSamsung  $209Bench 92%, 60,972 samples1x
RAM
TridentX DDR3 2400 C10 2x8GBG.SKILLBench 67%, 21,724 samples148x
Vengeance DDR3 1600 C10 2x8GBCorsairBench 53%, 33,985 samples105x
Savage DDR3 2400 C11 2x8GBHyperXBench 64%, 19,299 samples100x
EDIT WITH CUSTOM PC BUILDER Value: 48% - Average Total price: $1,099

Popular 840 Pro 256GB compatible motherboards:

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

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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.
  • - 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.
  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) June 2021 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.

 Comments

SSDrivePro
Avatar level
1,857

Official site www.samsung.com/...

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

Delivers high speeds for both compressible and incompressible data...

Added 8 years ago.
USA-User
Avatar level
7,886

Good (edit your comment) Add link

14 months ago.

Got it a year or so ago and I loved it then and still love it now, though it is a little pricy

Comment 

T61P with win7 64 &, Intel Extreme X9000, 8gb ram, fast ......... verrrry fast. Faster than many new computers. Gives a lot of new life to older PCs.—Sep '14

DEU-User
Avatar level
4,833

Excellent

2 years ago.

Owning it for almost 6 Years, still running very fast

CAN-User
Avatar level
4,118

Good

3 years ago.

An awesome drive! Going to get one to upgrade my rig!

POL-User
Avatar level
3,794

Good

4 years ago.

Excellent performance and reliability. I already have 5TB traffic over the past year. Performance has not decreased!

IND-User
Avatar level
3,744

Average

2 years ago.

Need to improve a lot on Research and Development . Please don't fool people with your small small improvements .With R&D U can do much better.

ESP-User
Avatar level
3,223

Liked

4 years ago.

AUT-User
Avatar level
2,263

Excellent

13 months ago.

Comment 

though for any practical purpose the EVO is just as good/fast—Sep '14

ZAF-User
Avatar level
2,244

Poor

5 years ago.

Can someone please explain to me why I get under 1MB/s 4K Mixed IO with my Samsung 840 pro when the average UBM Speed is 21.8MB/s for 4K Mixed IO operations?

SSDrivePro
Avatar level
1,857

Very good

8 years ago.

Review  hexus.net/...

Image  img.hexus.net/...
Sep '12 AS SSD Benchmark Test

Sep '12 AS SSD Benchmark Test

Review  www.hardocp.com/...

Review  www.servethehome.com/...

Image  www.servethehome.com/...
Nov '12 AS SSD Benchmark Test Score

Nov '12 AS SSD Benchmark Test Score

Review  www.custompcreview.com/...

Image  www.custompcreview.com/...
Sep '12 AS SSD Benchmark Speed Test Score

Sep '12 AS SSD Benchmark Speed Test Score

Deal  www.google.co.uk/...

Jun '13 £185 @Ebuyer

NZL-User
Avatar level
1,692

Liked

5 years ago.

Comment 

Great drive under normal/light load. Write latency starts to fall apart a bit under sustained loads.—Sep '14

Rand
Avatar level
427

Very good

8 years ago.

This drive, the latest from Samsung, takes SSD technology a small but clear step forward. It excels in the area of deep queue depth 4k random writes where it outperforms all of its direct competition. The brand new and almost impossible to get hold of Plextor M5 is currently the strongest competitor to the Samsung but until prices on the Plextor drop from an astronomical £250, Samsung have an easy win despite not having priced the 840 particularly aggressively themselves.

Nomekop
Avatar level
8

Excellent

7 years ago.

Just the best 256G SSD for me!

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1058 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different SSDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 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 i5-11400F $220Nvidia RTX 3070 $500Crucial MX500 250GB $45
Intel Core i5-11600K $259Nvidia RTX 3060-Ti $400Samsung 850 Evo 120GB $78
Intel Core i7-10700K $277Nvidia RTX 3080 $700Samsung 860 Evo 250GB $52
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35Corsair Vengeance LPX DDR4 3000 C15 2x8GB $94SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Ultra Fit 32GB $16
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