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Samsung MZ-7PD256BW

840 Pro 256GB

▲ 6320,542 ▼

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

VS

Average Bench: 91% (235th of 992)

Based on 35,759 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: 91% Great: 115%

Popular builds with this SSD

Excellent average bench

The Samsung 840 Pro 256GB averaged just 9.0% 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 137MB/s
Avg. 4K Random Mixed IO Speed 37.9MB/s

Below average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Pro 256GB is 52.8%. 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 283MB/s
Avg. Sequential Mixed IO Speed 287MB/s
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Average Bench

(Based on 35,759 samples)
Rank 23591%
Min Avg Max
344 Read 454 509
131 Write 352 479
208 Mixed 287 353
79.7 SusWrite 283 474
77% 344 MB/s
Min Avg Max
22 4K Read 30 36.3
43 4K Write 83.5 118
26.8 4K Mixed 37.9 46.9
138% 50.5 MB/s
Min Avg Max
35.7 DQ Read 328 384
111 DQ Write 253 332
45.8 DQ Mixed 137 174
144% 239 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
233GB free
Firmware: DXM05B0Q
SusWrite @10s intervals: 466 482 483 483 486 485 MB/s
111% Outstanding
Read 507
Write 475
Mixed 376
SusWrite 481
104% 460 MB/s
4K Read 32.5
4K Write 83.5
4K Mixed 42.8
148% 52.9 MB/s
DQ Read 378
DQ Write 334
DQ Mixed 179
183% 297 MB/s
112GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 435 437 444 437 438 397 MB/s
103% Outstanding
Read 442
Write 380
Mixed 253
SusWrite 431
85% 376 MB/s
4K Read 28.9
4K Write 84.8
4K Mixed 41.5
142% 51.7 MB/s
DQ Read 378
DQ Write 277
DQ Mixed 137
154% 264 MB/s
69GB free (System drive)
Firmware: DXM05B0Q
SusWrite @10s intervals: 136 140 147 129 126 130 MB/s
84.6% Excellent
Read 472
Write 196
Mixed 258
SusWrite 135
59% 265 MB/s
4K Read 31.9
4K Write 81.9
4K Mixed 39.2
142% 51 MB/s
DQ Read 383
DQ Write 232
DQ Mixed 132
145% 249 MB/s
35,759 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 13,029,063 SSDs tested.

 Prices

Approx. $203 @ launch in Oct '12
AmazonUS $8033 mins
OutletPCUS $1201 hr
EbayUS $30016 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 5,718 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 61%
Destroyer
Desktop
Desktop 71%
Battleship
Workstation
Workstation 53%
Yacht

Motherboard: Asus MAXIMUS VI HERO - $190

CPU
Core i7-4770KIntel  $352Bench 77%, 85,271 samples2,689x
Core i5-4670KIntel  $270Bench 79%, 64,080 samples1,206x
Core i7-4790KIntel  $365Bench 86%, 209,886 samples642x
GPU
GTX 970Nvidia  $374Bench 63%, 434,663 samples649x
GTX 1080Nvidia  $528Bench 124%, 407,741 samples552x
GTX 1070Nvidia  $370Bench 98%, 526,975 samples511x
SSD
840 Pro 256GBSamsung  $80Bench 91%, 35,759 samples1x
RAM
TridentX DDR3 2400 C10 2x8GBG.SKILLBench 69%, 11,309 samples195x
Vengeance DDR3 1600 C10 2x8GBCorsairBench 54%, 17,030 samples159x
Savage DDR3 2400 C11 2x8GBHyperXBench 66%, 12,546 samples143x
EDIT WITH CUSTOM PC BUILDER Value: 71% - Very good Total price: $996

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) March 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
5,000

Good (edit your comment) Add link

21 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

CAN-User
Avatar level
2,720

Good

10 months ago.

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

POL-User
Avatar level
2,628

Good

23 months ago.

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

IND-User
Avatar level
2,300

Average

7 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
2,277

Liked

22 months ago.

AUT-User
Avatar level
1,581

Liked

2 years ago.

Comment 

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

ZAF-User
Avatar level
1,436

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
1,230

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
145

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

4 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 i7-8700K $370Nvidia GTX 1070 $370Samsung 850 Evo 250GB $45
AMD Ryzen 5 1600 $122Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $105
Intel Core i5-8600K $260Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $97
HDDRAMUSB
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3000 C15 2x8GB $105SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $716SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $110SanDisk Ultra Fit 32GB $12
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