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Samsung

PM851 mSATA 256GB

▲ 514 ▼

Release date ≈ Q2 2014.

Average Bench: 67% (638th of 1011)

Based on 2,863 user benchmarks.  Models: SAMSUNG SSD PM851 mSATA 256GB, SAMSUNG SSD PM851 mSATA
Poor: 45%Average: 67% Great: 85%

Popular builds with this SSD

Above average average bench

The Samsung PM851 mSATA 256GB averaged 32.9% 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 312MB/s
Avg. 4K-64Thread Mixed IO Speed 71.9MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 256GB is 40.5%. 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 160MB/s
Avg. Sustained Write Speed 189MB/s
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Average Bench

(Based on 2,863 samples)
Rank 63867%
Min Avg Max
326 Read 415 486
54.2 Write 204 262
82.6 Mixed 160 193
45.7 SusWrite 189 252
53.6% 242 MB/s
Min Avg Max
11.5 4K Read 22.4 33.1
27.9 4K Write 55.1 87.4
13.6 4K Mixed 22.1 29.4
91.4% 33.2 MB/s
Min Avg Max
129 DQ Read 312 372
51.6 DQ Write 192 257
40.1 DQ Mixed 71.9 83.5
102% 192 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
208GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 191 186 235 192 131 146 MB/s
75.2% Very good
Read 486
Write 213
Mixed 189
SusWrite 180
59% 267 MB/s
4K Read 27.1
4K Write 67.6
4K Mixed 25.2
109% 40 MB/s
DQ Read 314
DQ Write 220
DQ Mixed 75.6
108% 203 MB/s
198GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 199 173 185 184 154 216 MB/s
71.7% Very good
Read 447
Write 205
Mixed 154
SusWrite 185
55% 248 MB/s
4K Read 24.9
4K Write 66.1
4K Mixed 22.7
102% 37.9 MB/s
DQ Read 362
DQ Write 178
DQ Mixed 71
106% 203 MB/s
198GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 197 195 157 152 119 176 MB/s
71.6% Very good
Read 436
Write 252
Mixed 191
SusWrite 166
58% 261 MB/s
4K Read 20.9
4K Write 65.4
4K Mixed 26.2
100% 37.5 MB/s
DQ Read 363
DQ Write 241
DQ Mixed 78.5
119% 227 MB/s
174GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 163 187 176 180 183 192 MB/s
62.1% Good
Read 391
Write 229
Mixed 169
SusWrite 180
54% 242 MB/s
4K Read 19.1
4K Write 42.1
4K Mixed 20.6
78% 27.3 MB/s
DQ Read 353
DQ Write 174
DQ Mixed 80.1
108% 202 MB/s
93GB free (System drive)
Firmware: EXT4
SusWrite @10s intervals: 130 100 97 96 90 79 MB/s
61.6% Good
Read 334
Write 163
Mixed 142
SusWrite 98.6
41% 185 MB/s
4K Read 27
4K Write 54.5
4K Mixed 25
102% 35.5 MB/s
DQ Read 340
DQ Write 170
DQ Mixed 82.3
107% 197 MB/s
156GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 193 178 182 211 246 247 MB/s
55.6% Above average
Read 382
Write 250
Mixed 179
SusWrite 210
57% 255 MB/s
4K Read 12.1
4K Write 38.4
4K Mixed 15.4
58% 22 MB/s
DQ Read 234
DQ Write 200
DQ Mixed 72.5
94% 169 MB/s
2,863 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 19,850,011 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 4,221 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 12%
Tree trunk
Desktop
Desktop 41%
Speed boat
Workstation
Workstation 21%
Surfboard

System: Dell Latitude E7440

CPU
Core i7-4600UIntelBench 41%, 13,725 samples1,818x
Core i5-4310UIntelBench 38%, 6,630 samples1,237x
Core i5-4300UIntelBench 37%, 19,884 samples961x
GPU
HD 4400 (Mobile 1.0/1.1 GHz)IntelBench 2%, 194,624 samples4,216x
Iris Pro Graphics 5200IntelBench 2%, 5 samples2x
GTX 1070Nvidia  $409Bench 78%, 677,712 samples2x
SSD
PM851 mSATA 256GBSamsungBench 67%, 2,863 samples777x
RAM
M471B1G73DB0-YK0 1x8GBSamsungBench 29%, 25,679 samples265x
HMT451S6BFR8A-PB 2x4GBHynixBench 48%, 22,162 samples201x
M471B5173DB0-YK0 2x4GBSamsungBench 48%, 12,973 samples164x
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Popular PM851 mSATA 256GB systems:

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  • - 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.
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Solid State Drive Rankings (Price vs Performance) December 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.

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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?
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Solid State Drives
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ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i5-9400F $145Nvidia GTX 1660S (Super) $244Crucial MX500 250GB $39
Intel Core i5-9600K $200Nvidia RTX 2060 $324Samsung 850 Evo 120GB $150
Intel Core i7-9700K $360AMD RX 590 $180Samsung 860 Evo 250GB $54
HDDRAMUSB
Seagate Barracuda 1TB (2016) $32Corsair Vengeance LPX DDR4 3200 C16 2x8GB $76SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $38Corsair Vengeance LPX DDR4 3000 C15 2x8GB $58SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $80G.SKILL Trident Z DDR4 3200 C14 4x16GB $613SanDisk Extreme 16GB $24
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