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Samsung MZ-7PD256BW

840 Pro 256GB

▲ 6420,549 ▼

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

Average Bench: 93.3% (260th of 1034)

Based on 53,910 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: 65%Average: 93.3% Great: 116%

Popular builds with this SSD

Excellent average bench

The Samsung 840 Pro 256GB averaged just 6.6% 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 142MB/s
Avg. 4K Random Mixed IO Speed 38.3MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 50.8%. 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 299MB/s
Avg. Sustained Write Speed 317MB/s
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Average Bench

(Based on 53,910 samples)
Rank 26093.3%
Min Avg Max
339 Read 457 510
139 Write 373 484
213 Mixed 299 362
92.9 SusWrite 317 480
81.1% 362 MB/s
Min Avg Max
21.9 4K Read 30.4 36.5
45 4K Write 81.3 116
26.5 4K Mixed 38.3 47.6
138% 50 MB/s
Min Avg Max
172 DQ Read 329 384
113 DQ Write 255 334
88.7 DQ Mixed 142 176
147% 242 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
238GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 475 474 476 481 482 480 MB/s
117% Outstanding
Read 494
Write 468
Mixed 366
SusWrite 478
102% 452 MB/s
4K Read 34.1
4K Write 110
4K Mixed 46.6
170% 63.5 MB/s
DQ Read 380
DQ Write 313
DQ Mixed 172
177% 288 MB/s
64GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 444 443 478 439 439 315 MB/s
116% Outstanding
Read 504
Write 454
Mixed 340
SusWrite 426
97% 431 MB/s
4K Read 36.1
4K Write 114
4K Mixed 48.2
177% 66.1 MB/s
DQ Read 383
DQ Write 314
DQ Mixed 171
176% 289 MB/s
110GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 272 269 267 250 255 252 MB/s
89.2% Excellent
Read 435
Write 344
Mixed 262
SusWrite 261
73% 325 MB/s
4K Read 28.6
4K Write 92.3
4K Mixed 33.4
135% 51.4 MB/s
DQ Read 374
DQ Write 296
DQ Mixed 136
156% 268 MB/s
202GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 390 409 402 373 373 416 MB/s
75.6% Very good
Read 387
Write 387
Mixed 319
SusWrite 394
84% 372 MB/s
4K Read 17.5
4K Write 33.8
4K Mixed 17
66% 22.8 MB/s
DQ Read 380
DQ Write 338
DQ Mixed 163
176% 294 MB/s
53,910 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 31,502,423 SSDs tested.

 Prices

Approx. $203 @ launch in Oct '12
OutletPCUS $1009 months
EbayUS $21010 mins
AmazonUS $2713 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 2,116 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 65%
Destroyer
Desktop
Desktop 84%
Aircraft carrier
Workstation
Workstation 54%
Yacht

Motherboard: Asus MAXIMUS VI HERO - $190

CPU
Core i7-4770KIntel  $280Bench 79%, 124,165 samples967x
Core i5-4670KIntel  $200Bench 79%, 111,824 samples446x
Core i7-4790KIntel  $348Bench 84%, 343,766 samples248x
GPU
GTX 1070Nvidia  $415Bench 78%, 913,064 samples165x
GTX 970Nvidia  $428Bench 51%, 633,465 samples159x
GTX 770Nvidia  $279Bench 41%, 96,729 samples141x
SSD
840 Pro 256GBSamsung  $100Bench 93%, 53,910 samples1x
RAM
TridentX DDR3 2400 C10 2x8GBG.SKILLBench 66%, 17,375 samples84x
Vengeance DDR3 1600 C10 2x8GBCorsairBench 54%, 29,262 samples57x
Savage DDR3 2400 C11 2x8GBHyperXBench 63%, 17,642 samples54x
EDIT WITH CUSTOM PC BUILDER Value: 53% - Above average Total price: $985

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

Gaming Desktop ProGaming

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) September 2020 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
1,854

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 7 years ago.
USA-User
Avatar level
6,888

Good (edit your comment) Add link

5 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
4,335

Excellent

17 months ago.

Owning it for almost 6 Years, still running very fast

CAN-User
Avatar level
3,644

Good

2 years ago.

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

POL-User
Avatar level
3,388

Good

3 years ago.

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

IND-User
Avatar level
3,264

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
2,969

Liked

3 years ago.

AUT-User
Avatar level
2,045

Excellent

4 months ago.

Comment 

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

ZAF-User
Avatar level
2,008

Poor

4 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
1,854

Very good

7 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
1,548

Liked

4 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
343

Very good

7 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

6 years ago.

Just the best 256G SSD for me!

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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 i5-9600K $193Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $43
Intel Core i7-9700K $290Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i5-9400F $143Nvidia RTX 2070S (Super) $500Samsung 860 Evo 250GB $43
HDDRAMUSB
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $66SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $32Corsair Vengeance LPX DDR4 3000 C15 2x8GB $64SanDisk Extreme 32GB $30
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $649SanDisk Extreme 16GB $28
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