Samsung

PM851 mSATA 256GB

PM851 mSATA 256GB
BENCHMARKS (1,749)
MKT (0%)
BUILDS
(1)

▲ 514 ▼

Release date ≈ Q2 2014.

128GB 256GB 512GB

Effective Speed -55%Effective Speed -55%Average User Bench -79%Read -13%, Write -104%, 4K Read -61%, 4K Write -66%, Mixed -127%, 4K Mixed -116%, SusWrite -69%Peak Lab Bench -64%Read -4%, Write -86%, 4K Read -35%, 4K Write -45%, Mixed -112%, 4K Mixed -102%, SusWrite -65%Value & Sentiment -1,131%User Rating -68%, Market Share -2,194%Nice To Haves -92%DQ Read -3%, DQ Write -41%, DQ Mixed -300%, ADQ Read -9%, ADQ Write -56%, ADQ Mixed -278%, Age -29%, AS-SSD Total -21%

Market Leaders

Average Bench: 67% (639^th of 1011)

Based on 1,749 user benchmarks. Models: SAMSUNG SSD PM851 mSATA 256GB, SAMSUNG SSD PM851 mSATA

Poor: 47%Average: 67% Great: 85%

Popular builds with this SSD

Above average average bench

The Samsung PM851 mSATA 256GB averaged 33.0% lower than the peak scores attained by the group leaders. This isn't a great result which indicates that there are much faster alternatives on the comparison list.

Strengths

Avg. 4K-64Thread Read Speed 305MB/s

Avg. 4K-64Thread Mixed IO Speed 71.8MB/s

See where your SSD ranks →

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 256GB is 37.2%. This is a relatively wide range which indicates that the Samsung PM851 mSATA 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sequential Mixed IO Speed 161MB/s

Avg. Sustained Write Speed 189MB/s

Average Bench

(Based on 1,749 samples)

Rank 63967%

Min	Avg	Max
322	Read 416	491
57	Write 206	262
88.5	Mixed 161	196
47.8	SusWrite 189	253
53.8% 243 MB/s

Min	Avg	Max
11.9	4K Read 22.5	33
28.5	4K Write 55.4	87.4
13.7	4K Mixed 22.2	30.1
91.8% 33.3 MB/s

Min	Avg	Max
110	DQ Read 305	372
50.9	DQ Write 190	257
29.6	DQ Mixed 71.8	83.8
101% 189 MB/s

User Benchmarks

Bench

Sequential

Random 4k

Deep queue 4k

The fastest SSD (mainstream) averages a speed of 100%

VNM-User, 1 day ago.

215GB free (System drive)

Firmware: EXT48D0Q

SusWrite @10s intervals: 223 248 248 249 247 250 MB/s

89.6% Excellent

Write 252

Mixed 177

SusWrite 244

64% 286 MB/s

4K Read 37

4K Write 89.8

4K Mixed 29.8

142% 52.2 MB/s

DQ Read 367

DQ Write 244

DQ Mixed 80.2

121% 230 MB/s

GBR-User, 3 hrs ago.

195GB free (System drive)

Firmware: EXT49D0Q

SusWrite @10s intervals: 209 236 249 252 251 250 MB/s

86.8% Excellent

Write 256

Mixed 189

SusWrite 241

65% 293 MB/s

4K Read 29.6

4K Write 90.3

4K Mixed 29.1

130% 49.7 MB/s

DQ Read 368

DQ Write 246

DQ Mixed 81.2

122% 232 MB/s

CAN-User, 5 hrs ago.

159GB free (System drive)

Firmware: EXT48D0Q

SusWrite @10s intervals: 221 219 243 247 250 247 MB/s

71.6% Very good

Write 246

Mixed 181

SusWrite 238

62% 278 MB/s

4K Read 21.4

4K Write 40.6

4K Mixed 23.2

84% 28.4 MB/s

DQ Read 370

DQ Write 233

DQ Mixed 78.7

119% 228 MB/s

USA-User, 1 day ago.

129GB free (System drive)

Firmware: EXT49D0Q

SusWrite @10s intervals: 216 214 227 238 229 244 MB/s

63.8% Good

Write 258

Mixed 157

SusWrite 228

56% 251 MB/s

4K Read 22.9

4K Write 42.9

4K Mixed 23.7

88% 29.8 MB/s

DQ Read 216

DQ Write 167

DQ Mixed 69.9

85% 151 MB/s

USA-User, 2 days ago.

101GB free (System drive)

Firmware: EXT4AD0Q

SusWrite @10s intervals: 199 182 190 180 179 171 MB/s

57.3% Above average

Write 245

Mixed 174

SusWrite 183

53% 238 MB/s

4K Read 12.2

4K Write 34

4K Mixed 17.8

59% 21.3 MB/s

DQ Read 361

DQ Write 256

DQ Mixed 78.7

121% 232 MB/s

HUN-User, 12 hrs ago.

21GB free (System drive)

Firmware: EXT49D0Q

SusWrite @10s intervals: 68 77 84 74 50 110 MB/s

54.7% Above average

Write 57.1

Mixed 73.5

SusWrite 77.1

37% 171 MB/s

4K Read 24.7

4K Write 41.3

4K Mixed 13.3

76% 26.4 MB/s

DQ Read 328

DQ Write 63

DQ Mixed 64.8

81% 152 MB/s

IND-User, 2 days ago.

75GB free (System drive)

Firmware: EXT4AD0Q

SusWrite @10s intervals: 165 93 59 57 51 141 MB/s

52% Above average

Write 69.2

Mixed 102

SusWrite 94.5

36% 165 MB/s

4K Read 18.8

4K Write 40.8

4K Mixed 18.4

74% 26 MB/s

DQ Read 309

DQ Write 54

DQ Mixed 67.6

79% 144 MB/s

1,749 MORE »

Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 17,726,656 SSDs tested.

Custom PC Builder (Start a new build) Build your perfect PC: compare component prices, popularity, speed and value for money.

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CPU

GPU

SSD

HDD

RAM

MBD

Typical PM851 mSATA 256GB Builds (Compare 3,807 builds) See popular component choices, score breakdowns and rankings.

Gaming 12%

Tree trunk

Desktop 40%

Speed boat

Workstation 21%

Surfboard

System: Dell Latitude E7440

CPU
Core i7-4600UIntelBench 32%, 13,071 samples	1,652x
Core i5-4310UIntelBench 30%, 4,590 samples	1,101x
Core i5-4300UIntelBench 29%, 19,383 samples	872x

GPU
HD 4400 (Mobile 1.0/1.1 GHz)IntelBench 3%, 175,853 samples	3,802x
Iris Pro Graphics 5200IntelBench 3%, 5 samples	2x
GTX 1070Nvidia $409Bench 78%, 603,111 samples	2x

SSD
PM851 mSATA 256GBSamsungBench 67%, 1,749 samples	722x

RAM
M471B1G73DB0-YK0 1x8GBSamsungBench 28%, 23,378 samples	239x
HMT451S6BFR8A-PB 2x4GBHynixBench 47%, 20,356 samples	182x
M471B5173DB0-YK0 2x4GBSamsungBench 47%, 16,369 samples	151x

EDIT WITH CUSTOM PC BUILDER

Popular PM851 mSATA 256GB systems:

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.
- Explore your best upgrade options with a virtual PC build.
- Compare your in-game FPS to other users with your hardware.
- Share your opinion by voting.

Solid State Drive Rankings (Price vs Performance) September 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]

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.

1011 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 »

CPU	GPU	SSD
Intel Core i5-9400F $140	Nvidia GTX 1660 $220	Samsung 850 Evo 250GB $70
Intel Core i5-9600K $225	Nvidia GTX 1660-Ti $275	Samsung 850 Evo 500GB $90
Intel Core i7-9700K $350	Nvidia RTX 2060S (Super) $429	Samsung 850 Pro 256GB $230

HDD	RAM	USB
Seagate Barracuda 1TB (2016) $44	Corsair Vengeance LPX DDR4 3000 C15 2x8GB $70	SanDisk Extreme 64GB $88
WD Blue 1TB (2012) $37	G.SKILL Trident Z DDR4 3200 C14 4x16GB $799	SanDisk Extreme 32GB $48
Seagate Barracuda 3TB (2016) $64	Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73	SanDisk Extreme 16GB $24

Samsung

PM851 mSATA 256GB

Average Bench: 67% (639^th of 1011)

Popular builds with this SSD

Above average average bench

Strengths

Above average consistency

Weaknesses

Average Bench

Market Share (See Leaders)

CHOOSE A COMPONENT:

System: Dell Latitude E7440

Popular PM851 mSATA 256GB systems:

UserBenchmark of the month

How it works

Group Test Results

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Frequently Asked Questions

Best User Rated

Samsung

PM851 mSATA 256GB

Average Bench: 67% (639th of 1011)

Popular builds with this SSD

Above average average bench

Strengths

Above average consistency

Weaknesses

Average Bench

Market Share (See Leaders)

CHOOSE A COMPONENT:

System: Dell Latitude E7440

Popular PM851 mSATA 256GB systems:

UserBenchmark of the month

How it works

Group Test Results

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Comments

Liked (edit your comment) Add link

Speed Comparisons

Frequently Asked Questions

Best User Rated

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Average Bench: 67% (639^th of 1011)