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Samsung MZ-7PD256BW

840 Pro 256GB

▲ 5420,556 ▼

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

Average Bench: 95% (287th of 1080)

Based on 73,119 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: 68%Average: 95% Great: 116%

Popular builds with this SSD

Excellent average bench

The Samsung 840 Pro 256GB averaged just 5.0% 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 147MB/s
Avg. 4K Random Mixed IO Speed 39.5MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 48.5%. 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 303MB/s
Avg. Sustained Write Speed 312MB/s
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Average Bench

(Based on 73,119 samples)
Rank 28795%
Min Avg Max
359 Read 459 510
138 Write 367 480
215 Mixed 303 368
84.6 SusWrite 312 477
80.7% 360 MB/s
Min Avg Max
22.1 4K Read 31 36.1
44.4 4K Write 85.6 114
26.9 4K Mixed 39.5 47.6
143% 52 MB/s
Min Avg Max
216 DQ Read 346 385
132 DQ Write 262 334
112 DQ Mixed 147 176
153% 252 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
238GB free
Firmware: DXM06B0Q
SusWrite @10s intervals: 445 429 426 431 427 416 MB/s
113% Outstanding
Read 505
Write 426
Mixed 349
SusWrite 429
96% 427 MB/s
4K Read 34.5
4K Write 105
4K Mixed 45.3
166% 61.7 MB/s
DQ Read 382
DQ Write 305
DQ Mixed 154
167% 280 MB/s
47GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 136 129 136 133 128 128 MB/s
83.7% Excellent
Read 498
Write 291
Mixed 254
SusWrite 132
65% 294 MB/s
4K Read 32.1
4K Write 78
4K Mixed 37.4
138% 49.2 MB/s
DQ Read 374
DQ Write 226
DQ Mixed 129
142% 243 MB/s
102GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 327 302 285 258 244 234 MB/s
74.7% Very good
Read 454
Write 388
Mixed 289
SusWrite 275
79% 351 MB/s
4K Read 22.4
4K Write 39.9
4K Mixed 27.5
90% 29.9 MB/s
DQ Read 297
DQ Write 224
DQ Mixed 149
142% 223 MB/s
73,119 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 76,509,235 SSDs tested

 Prices

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MSRP ≈ $203 @ launch in Oct '12
EbayUS $1754 mins
AmazonUS $2385 months
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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 4,102 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 56%
Gunboat
Desktop
Desktop 77%
Battleship
Workstation
Workstation 44%
Speed boat

Motherboard: MSI Z87-G45 GAMING (MS-7821) - $242

CPU
Core i5-4670KIntel  $52Bench 68%, 128,482 samples1,400x
Core i7-4770KIntel  $100Bench 74%, 172,887 samples1,229x
Core i7-4790KIntel  $348Bench 79%, 455,746 samples398x
GPU
GTX 1070Nvidia  $278Bench 80%, 1,459,281 samples327x
GTX 970Nvidia  $200Bench 49%, 834,238 samples324x
GTX 1060-6GBNvidia  $117Bench 56%, 1,368,019 samples315x
SSD
840 Pro 256GBSamsung  $175Bench 95%, 73,119 samples1x
RAM
BLS8G3D1609DS1S00. 2x8GBCrucialBench 55%, 48,796 samples86x
Fury DDR3 1866 C10 2x8GBHyperXBench 59%, 122,541 samples78x
HyperX DDR3 1600 C10 2x8GBKingstonBench 50%, 19,207 samples74x
EDIT WITH CUSTOM PC BUILDER Value: 51% - Above average Total price: $747

Popular 840 Pro 256GB compatible motherboards:

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Solid State Drive Rankings (Price vs Performance) July 2024 SSD Rankings

Welcome to our 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
1,921

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 11 years ago.
USA-User
Avatar level
9,918

Good (edit your comment) Add link

4 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
5,793

Excellent

5 years ago.

Owning it for almost 6 Years, still running very fast

CAN-User
Avatar level
5,010

Good

6 years ago.

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

IND-User
Avatar level
4,830

Average

5 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.

POL-User
Avatar level
4,616

Good

7 years ago.

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

ESP-User
Avatar level
3,765

Liked

7 years ago.

ZAF-User
Avatar level
2,826

Poor

8 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?

AUT-User
Avatar level
2,759

Excellent

4 years ago.

Comment 

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

NZL-User
Avatar level
2,152

Liked

8 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
1,921

Very good

11 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

Yodabest
Avatar level
605

Very good

11 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

10 years ago.

Just the best 256G SSD for me!

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 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?
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