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Samsung MZ-7PD256BW

840 Pro 256GB

▲ 6420,546 ▼

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

Average Bench: 93.4% (236th of 1011)

Based on 36,748 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: 63%Average: 93.4% 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 141MB/s
Avg. 4K Random Mixed IO Speed 39.3MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 53.1%. This is a relatively wide range which indicates that the Samsung 840 Pro 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 293MB/s
Avg. Sequential Mixed IO Speed 294MB/s
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Average Bench

(Based on 36,748 samples)
Rank 23693.4%
Min Avg Max
342 Read 459 510
135 Write 364 482
208 Mixed 294 363
86 SusWrite 293 474
79% 353 MB/s
Min Avg Max
21.5 4K Read 30.7 36.5
46.1 4K Write 86.5 117
28.2 4K Mixed 39.3 48
143% 52.1 MB/s
Min Avg Max
162 DQ Read 333 385
113 DQ Write 258 334
83.8 DQ Mixed 141 175
148% 244 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
81GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 393 414 428 434 433 434 MB/s
98% Outstanding
Read 473
Write 436
Mixed 354
SusWrite 423
95% 421 MB/s
4K Read 30
4K Write 78.5
4K Mixed 38.4
136% 49 MB/s
DQ Read 263
DQ Write 240
DQ Mixed 148
139% 217 MB/s
29GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 164 137 117 107 92 97 MB/s
89.2% Excellent
Read 492
Write 302
Mixed 248
SusWrite 119
64% 290 MB/s
4K Read 34.8
4K Write 102
4K Mixed 42.7
161% 59.8 MB/s
DQ Read 343
DQ Write 227
DQ Mixed 126
137% 232 MB/s
59GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 452 380 170 149 141 138 MB/s
87.5% Excellent
Read 501
Write 450
Mixed 322
SusWrite 238
85% 378 MB/s
4K Read 32.2
4K Write 79.2
4K Mixed 39.7
142% 50.4 MB/s
DQ Read 220
DQ Write 188
DQ Mixed 114
110% 174 MB/s
187GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 443 440 440 445 450 448 MB/s
85.1% Excellent
Read 465
Write 449
Mixed 315
SusWrite 444
94% 418 MB/s
4K Read 21.3
4K Write 42.7
4K Mixed 27.1
90% 30.4 MB/s
DQ Read 264
DQ Write 249
DQ Mixed 143
138% 219 MB/s
36,748 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 19,849,350 SSDs tested.

 Prices

Approx. $203 @ launch in Oct '12
OutletPCUS $1001 day
AmazonUS $2105 mins
EbayUS $21813 mins
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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 7,628 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%, 105,909 samples3,634x
Core i5-4670KIntel  $300Bench 72%, 92,082 samples1,555x
Core i7-4790KIntel  $348Bench 78%, 274,297 samples877x
GPU
GTX 970Nvidia  $399Bench 52%, 512,504 samples816x
GTX 1080Nvidia  $412Bench 103%, 554,017 samples693x
GTX 1070Nvidia  $409Bench 78%, 677,712 samples678x
SSD
840 Pro 256GBSamsung  $100Bench 93%, 36,748 samples1x
RAM
TridentX DDR3 2400 C10 2x8GBG.SKILLBench 67%, 13,746 samples259x
Vengeance DDR3 1600 C10 2x8GBCorsairBench 55%, 23,000 samples221x
Vengeance Pro DDR3 2400 C11 2x8GBCorsairBench 61%, 23,009 samples180x
EDIT WITH CUSTOM PC BUILDER Value: 43% - Average Total price: $982

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.
  • - Compare your components to the current market leaders.
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  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) December 2019 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
5,966

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
3,765

Excellent

8 months ago.

Owning it for almost 6 Years, still running very fast

CAN-User
Avatar level
3,156

Good

19 months ago.

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

POL-User
Avatar level
2,968

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
2,710

Average

16 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
2,643

Liked

2 years ago.

AUT-User
Avatar level
1,787

Liked

2 years ago.

Comment 

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

ZAF-User
Avatar level
1,744

Poor

3 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
1,376

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
315

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 i5-9400F $145Nvidia GTX 1660S (Super) $244Crucial MX500 250GB $39
Intel Core i5-9600K $200Nvidia RTX 2060 $324Samsung 850 Evo 120GB $150
Intel Core i7-9700K $360AMD RX 590 $180Samsung 860 Evo 250GB $54
HDDRAMUSB
Seagate Barracuda 1TB (2016) $32Corsair Vengeance LPX DDR4 3200 C16 2x8GB $76SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $38Corsair Vengeance LPX DDR4 3000 C15 2x8GB $58SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $613SanDisk Extreme 16GB $24
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