Samsung

PM851 mSATA 256GB

PM851 mSATA 256GB
BENCHMARKS (5,531)
MKT (0%)
BUILDS
(1)

Effective Speed -51%Effective Speed -51%Average Score -79%Read -11%, Write -113%, 4K Read -52%, 4K Write -61%, Mixed -132%, 4K Mixed -104%, SusWrite -79%Peak Score -60%Read -3%, Write -86%, 4K Read -26%, 4K Write -42%, Mixed -117%, 4K Mixed -96%, SusWrite -53%Value & Sentiment -762%User Rating -13%, Market Share -1,511%Nice To Haves -90%DQ Read 2%, DQ Write -40%, DQ Mixed -297%, ADQ Read 0%, ADQ Write -65%, ADQ Mixed -257%, Age -42%, AS-SSD Total -17%

Average Bench: 65.4% (722^nd of 1058)

Based on 5,531 user benchmarks. Models: SAMSUNG SSD PM851 mSATA 256GB, SAMSUNG SSD PM851 mSATA

Poor: 45%Average: 65.4% Great: 84%

Popular builds with this SSD

Above average average bench

The Samsung PM851 mSATA 256GB averaged 34.5% 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 323MB/s

Avg. 4K-64Thread Mixed IO Speed 72.8MB/s

See where your SSD ranks →

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 256GB is 39.3%. 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 155MB/s

Avg. Sustained Write Speed 168MB/s

Average Bench

(Based on 5,531 samples)

Rank 72265.4%

Min	Avg	Max
318	Read 416	491
48.6	Write 190	261
84.7	Mixed 155	195
39.4	SusWrite 168	252
51.2% 232 MB/s

Min	Avg	Max
11.1	4K Read 22.5	34.1
22.2	4K Write 53.6	84.2
13.3	4K Mixed 22.1	29.6
90.9% 32.8 MB/s

Min	Avg	Max
151	DQ Read 323	373
50	DQ Write 174	256
45	DQ Mixed 72.8	83.2
101% 190 MB/s

User Benchmarks

Bench

Sequential

Random 4k

Deep queue 4k

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

GBR-User, 1 day ago.

102GB free

Firmware: EXT4AD0Q

SusWrite @10s intervals: 255 256 256 256 255 255 MB/s

83.1% Excellent

Write 260

Mixed 199

SusWrite 255

67% 302 MB/s

4K Read 33.1

4K Write 71.6

4K Mixed 30.1

127% 44.9 MB/s

DQ Read 229

DQ Write 197

DQ Mixed 74.3

94% 167 MB/s

HND-User, 2 days ago.

190GB free (System drive)

Firmware: EXT48D0Q

SusWrite @10s intervals: 187 170 240 236 246 248 MB/s

76.7% Very good

Write 249

Mixed 174

SusWrite 221

59% 267 MB/s

4K Read 29.3

4K Write 63.8

4K Mixed 24

109% 39 MB/s

DQ Read 360

DQ Write 254

DQ Mixed 76

119% 230 MB/s

USA-User, 3 days ago.

158GB free (System drive)

Firmware: EXT48D0Q

SusWrite @10s intervals: 188 216 226 234 234 242 MB/s

74.5% Very good

Write 244

Mixed 173

SusWrite 223

60% 271 MB/s

4K Read 25.4

4K Write 55.2

4K Mixed 24.9

100% 35.2 MB/s

DQ Read 372

DQ Write 208

DQ Mixed 81.6

116% 221 MB/s

USA-User, 22 hrs ago.

198GB free (System drive)

Firmware: EXT4AD0Q

SusWrite @10s intervals: 177 197 241 248 263 262 MB/s

74% Very good

Write 247

Mixed 196

SusWrite 232

63% 286 MB/s

4K Read 23.8

4K Write 48.7

4K Mixed 23.2

92% 31.9 MB/s

DQ Read 370

DQ Write 226

DQ Mixed 81.6

119% 226 MB/s

USA-User, 1 day ago.

189GB free (System drive)

Firmware: EXT48D0Q

SusWrite @10s intervals: 200 135 179 238 255 256 MB/s

70.2% Very good

Write 258

Mixed 171

SusWrite 210

54% 241 MB/s

4K Read 23.6

4K Write 64.9

4K Mixed 24

101% 37.5 MB/s

DQ Read 369

DQ Write 251

DQ Mixed 79.1

122% 233 MB/s

USA-User, 3 days ago.

88GB free (System drive)

Firmware: EXT49D0Q

SusWrite @10s intervals: 125 108 118 111 100 104 MB/s

69.3% Good

Write 122

Mixed 143

SusWrite 111

46% 210 MB/s

4K Read 27.5

4K Write 58.9

4K Mixed 27.1

108% 37.8 MB/s

DQ Read 347

DQ Write 157

DQ Mixed 75.3

103% 193 MB/s

USA-User, 23 hrs ago.

195GB free (System drive)

Firmware: EXT48D0Q

SusWrite @10s intervals: 240 252 252 237 255 249 MB/s

67.1% Good

Write 258

Mixed 180

SusWrite 248

60% 268 MB/s

4K Read 15.8

4K Write 42.9

4K Mixed 23.7

77% 27.5 MB/s

DQ Read 325

DQ Write 241

DQ Mixed 74.2

112% 213 MB/s

GBR-User, 2 days ago.

152GB free (System drive)

Firmware: EXT4AD0Q

SusWrite @10s intervals: 154 155 131 108 160 160 MB/s

40.8% Average

Write 156

Mixed 154

SusWrite 145

43% 195 MB/s

4K Read 12.1

4K Write 22.6

4K Mixed 15.2

50% 16.6 MB/s

DQ Read 22.8

DQ Write 134

DQ Mixed 57.6

50% 71.3 MB/s

5,531 MORE »

Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 44,172,041 SSDs tested.

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 PM851 mSATA 256GB Builds (Compare 2,783 builds) See popular component choices, score breakdowns and rankings.

Gaming 5%

Tree trunk

Desktop 53%

Yacht

Workstation 4%

Tree trunk

System: Dell Latitude E7440

CPU
Core i7-4600UIntelBench 54%, 19,683 samples	1,053x
Core i5-4310UIntelBench 52%, 11,488 samples	975x
Core i5-4300UIntelBench 51%, 30,583 samples	610x

GPU
HD 4400 (Mobile 1.0/1.1 GHz)IntelBench 2%, 244,568 samples	2,773x
HD Graphics 530IntelBench 3%, 2 samples	2x
GTX 1060-6GBNvidia $290Bench 57%, 1,201,235 samples	2x

SSD
PM851 mSATA 256GBSamsungBench 65%, 5,531 samples	439x

RAM
M471B1G73DB0-YK0 1x8GBSamsungBench 28%, 39,328 samples	147x
HMT451S6BFR8A-PB 2x4GBHynixBench 47%, 36,317 samples	139x
M471B5173DB0-YK0 2x4GBSamsungBench 48%, 24,897 samples	114x

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.

UserBenchmark of the month

Gaming

Desktop

ProGaming

CPU

GPU

SSD

HDD

RAM

USB

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) June 2021 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.

1058 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 i5-11400F $220	Nvidia RTX 3070 $500	Crucial MX500 250GB $45
Intel Core i5-11600K $259	Nvidia RTX 3060-Ti $400	Samsung 850 Evo 120GB $78
Intel Core i7-10700K $277	Nvidia RTX 3080 $700	Samsung 860 Evo 250GB $52

HDD	RAM	USB
Seagate Barracuda 1TB (2016) $45	Corsair Vengeance LPX DDR4 3200 C16 2x8GB $79	SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $35	Corsair Vengeance LPX DDR4 3000 C15 2x8GB $94	SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $80	G.SKILL Trident Z DDR4 3200 C14 4x16GB $649	SanDisk Ultra Fit 32GB $16

Samsung

PM851 mSATA 256GB

Average Bench: 65.4% (722^nd of 1058)

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

Comments

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Speed Comparisons

Frequently Asked Questions

Best User Rated

Samsung

PM851 mSATA 256GB

Average Bench: 65.4% (722nd of 1058)

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

Share a related link

Comments

Liked (edit your comment) Add link

Speed Comparisons

Frequently Asked Questions

Best User Rated

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Average Bench: 65.4% (722^nd of 1058)