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Samsung MZ-7PD256BW

840 Pro 256GB

▲ 6420,547 ▼

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

Average Bench: 92.6% (254th of 1016)

Based on 39,565 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]

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Poor: 65%Average: 92.6% Great: 116%

Popular builds with this SSD

Excellent average bench

The Samsung 840 Pro 256GB averaged just 7.4% 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 139MB/s
Avg. 4K Random Mixed IO Speed 38.5MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 50.5%. 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 308MB/s
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Average Bench

(Based on 39,565 samples)
Rank 25492.6%
Min Avg Max
335 Read 456 509
124 Write 371 483
214 Mixed 297 361
85.3 SusWrite 308 474
80.2% 358 MB/s
Min Avg Max
20.7 4K Read 30.2 36.3
43.6 4K Write 82.7 116
26.5 4K Mixed 38.5 47.9
139% 50.5 MB/s
Min Avg Max
103 DQ Read 321 385
110 DQ Write 248 333
71.3 DQ Mixed 139 175
143% 236 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
106GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 405 407 404 404 402 402 MB/s
110% Outstanding
Read 506
Write 479
Mixed 354
SusWrite 404
98% 436 MB/s
4K Read 34.8
4K Write 96.2
4K Mixed 43.4
159% 58.1 MB/s
DQ Read 379
DQ Write 331
DQ Mixed 152
169% 287 MB/s
196GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 401 409 429 429 421 423 MB/s
102% Outstanding
Read 443
Write 422
Mixed 287
SusWrite 419
88% 393 MB/s
4K Read 27.9
4K Write 84.8
4K Mixed 41.7
141% 51.5 MB/s
DQ Read 380
DQ Write 308
DQ Mixed 142
161% 277 MB/s
238GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 444 453 452 450 447 451 MB/s
102% Outstanding
Read 507
Write 448
Mixed 326
SusWrite 450
97% 433 MB/s
4K Read 36.7
4K Write 59.3
4K Mixed 39
137% 45 MB/s
DQ Read 375
DQ Write 162
DQ Mixed 141
138% 226 MB/s
122GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 183 207 203 199 192 192 MB/s
90.3% Outstanding
Read 495
Write 396
Mixed 294
SusWrite 196
77% 345 MB/s
4K Read 31
4K Write 81.5
4K Mixed 39.6
141% 50.7 MB/s
DQ Read 384
DQ Write 288
DQ Mixed 160
168% 278 MB/s
39,565 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 21,680,567 SSDs tested.

 Prices

Approx. $203 @ launch in Oct '12
OutletPCUS $1001 month
EbayUS $21019 mins
AmazonUS $2192 days
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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 8,083 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 51%
Yacht
Desktop
Desktop 67%
Battle cruiser
Workstation
Workstation 47%
Yacht

Motherboard: Asus MAXIMUS VI HERO - $190

CPU
Core i7-4770KIntel  $293Bench 71%, 112,842 samples3,861x
Core i5-4670KIntel  $210Bench 72%, 93,230 samples1,628x
Core i7-4790KIntel  $348Bench 79%, 285,587 samples942x
GPU
GTX 970Nvidia  $428Bench 52%, 527,770 samples855x
GTX 1080Nvidia  $540Bench 104%, 564,777 samples725x
GTX 1070Nvidia  $346Bench 78%, 703,911 samples717x
SSD
840 Pro 256GBSamsung  $100Bench 93%, 39,565 samples1x
RAM
TridentX DDR3 2400 C10 2x8GBG.SKILLBench 68%, 14,728 samples282x
Vengeance DDR3 1600 C10 2x8GBCorsairBench 54%, 24,633 samples230x
Vengeance Pro DDR3 2400 C11 2x8GBCorsairBench 61%, 28,835 samples190x
EDIT WITH CUSTOM PC BUILDER Value: 41% - Average Total price: $1,011

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.

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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.
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  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) January 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
1,352

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
6,132

Good (edit your comment) Add link

2 years 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
3,873

Excellent

9 months ago.

Owning it for almost 6 Years, still running very fast

CAN-User
Avatar level
3,264

Good

20 months ago.

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

POL-User
Avatar level
3,048

Good

2 years ago.

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

IND-User
Avatar level
2,808

Average

18 months 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
2,695

Liked

2 years ago.

AUT-User
Avatar level
1,827

Liked

2 years ago.

Comment 

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

ZAF-User
Avatar level
1,794

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?

NZL-User
Avatar level
1,396

Liked

3 years ago.

Comment 

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

SSDrivePro
Avatar level
1,352

Very good

6 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

Rand
Avatar level
317

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

5 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 $218Nvidia GTX 1660S (Super) $240Crucial MX500 250GB $43
Intel Core i5-9400F $155Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $370Nvidia RTX 2060 $340Samsung 850 Pro 512GB $204
HDDRAMUSB
Seagate Barracuda 1TB (2016) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $63SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $643SanDisk Ultra Fit 32GB $16
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