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Samsung MZ-7PD256BW

840 Pro 256GB

▲ 6420,544 ▼

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

VS

Average Bench: 92.2% (228th of 1000)

Based on 34,020 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: 58%Average: 92.2% Great: 117%

Popular builds with this SSD

Excellent average bench

The Samsung 840 Pro 256GB averaged just 7.8% 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 37.6MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 59.2%. 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 292MB/s
Avg. Sustained Write Speed 310MB/s
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Average Bench

(Based on 34,020 samples)
Rank 22892.2%
Min Avg Max
339 Read 452 509
137 Write 370 484
206 Mixed 292 359
84.9 SusWrite 310 480
79.8% 356 MB/s
Min Avg Max
20.2 4K Read 29.8 36.6
40.1 4K Write 81.9 117
25.2 4K Mixed 37.6 47.8
137% 49.8 MB/s
Min Avg Max
33.1 DQ Read 329 384
110 DQ Write 261 334
42.6 DQ Mixed 139 175
147% 243 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
212GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 493 493 494 494 494 494 MB/s
124% Outstanding
Read 513
Write 421
Mixed 377
SusWrite 494
102% 451 MB/s
4K Read 37.2
4K Write 127
4K Mixed 50.9
189% 71.8 MB/s
DQ Read 383
DQ Write 313
DQ Mixed 173
177% 289 MB/s
169GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 341 305 360 366 367 366 MB/s
93.2% Outstanding
Read 376
Write 366
Mixed 279
SusWrite 351
77% 343 MB/s
4K Read 33.9
4K Write 84.4
4K Mixed 42.2
150% 53.5 MB/s
DQ Read 250
DQ Write 217
DQ Mixed 135
128% 200 MB/s
204GB free (System drive)
Firmware: DXM06B0Q
SusWrite @10s intervals: 376 393 408 390 391 366 MB/s
53.4% Above average
Read 263
Write 260
Mixed 179
SusWrite 387
62% 272 MB/s
4K Read 10.9
4K Write 29.8
4K Mixed 16.5
53% 19.1 MB/s
DQ Read 30.2
DQ Write 80.1
DQ Mixed 38.8
34% 49.7 MB/s
34,020 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 14,373,882 SSDs tested.

 Prices

Approx. $203 @ launch in Oct '12
AmazonUS $903 days
OutletPCUS $9913 hrs
EbayUS $11131 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 6,115 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 61%
Destroyer
Desktop
Desktop 72%
Battleship
Workstation
Workstation 53%
Yacht

Motherboard: Asus MAXIMUS VI HERO - $190

CPU
Core i7-4770KIntel  $440Bench 78%, 86,608 samples2,883x
Core i5-4670KIntel  $270Bench 79%, 73,107 samples1,292x
Core i7-4790KIntel  $365Bench 86%, 211,195 samples689x
GPU
GTX 970Nvidia  $374Bench 63%, 433,580 samples689x
GTX 1080Nvidia  $528Bench 123%, 449,288 samples574x
GTX 1070Nvidia  $314Bench 98%, 573,744 samples545x
SSD
840 Pro 256GBSamsung  $90Bench 92%, 34,020 samples1x
RAM
TridentX DDR3 2400 C10 2x8GBG.SKILLBench 68%, 12,491 samples209x
Vengeance DDR3 1600 C10 2x8GBCorsairBench 55%, 16,986 samples168x
Vengeance Pro DDR3 2400 C11 2x8GBCorsairBench 63%, 20,707 samples152x
EDIT WITH CUSTOM PC BUILDER Value: 68% - Good Total price: $1,094

Popular 840 Pro 256GB compatible motherboards:

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  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write, sustained write and mixed IO.
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Solid State Drive Rankings (Price vs Performance) May 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 6 years ago.
USA-User
Avatar level
5,178

Good (edit your comment) Add link

23 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
3,377

Excellent

1 month ago.

Owning it for almost 6 Years, still running very fast

CAN-User
Avatar level
2,838

Good

12 months ago.

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

POL-User
Avatar level
2,710

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
2,388

Average

9 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
2,355

Liked

24 months ago.

AUT-User
Avatar level
1,627

Liked

2 years ago.

Comment 

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

ZAF-User
Avatar level
1,478

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?

SSDrivePro
Avatar level
1,352

Very good

5 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
1,248

Liked

3 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
147

Very good

6 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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1000 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 i7-8700K $356Nvidia GTX 1070 $314Samsung 850 Evo 250GB $92
AMD Ryzen 5 2600 $145Nvidia GTX 1060-6GB $208Samsung 850 Evo 500GB $99
AMD Ryzen 5 1600 $108Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $163
HDDRAMUSB
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $90SanDisk Extreme 64GB $128
WD Blue 1TB (2012) $40G.SKILL Trident Z DDR4 3200 C14 4x16GB $651SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $73Corsair Vengeance LPX DDR4 3200 C16 2x8GB $85SanDisk Ultra Fit 32GB $12
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