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Samsung

PM851 mSATA 256GB

▲ 515 ▼

Release date ≈ Q2 2014.

Average Bench: 67% (652nd of 1021)

Based on 4,180 user benchmarks.  Models: SAMSUNG SSD PM851 mSATA 256GB, SAMSUNG SSD PM851 mSATA
Poor: 46%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 314MB/s
Avg. 4K Random Read Speed 23MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 256GB is 38.7%. 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 159MB/s
Avg. Sustained Write Speed 182MB/s
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Average Bench

(Based on 4,180 samples)
Rank 65267%
Min Avg Max
330 Read 418 490
55 Write 201 261
85.4 Mixed 159 196
46.3 SusWrite 182 252
53.1% 240 MB/s
Min Avg Max
11.4 4K Read 23 33.6
25.2 4K Write 55.4 85.9
14 4K Mixed 22.4 29.5
92.9% 33.6 MB/s
Min Avg Max
126 DQ Read 314 372
52 DQ Write 184 257
45.9 DQ Mixed 72 83.7
101% 190 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
184GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 235 239 253 253 253 252 MB/s
77.4% Very good
Read 414
Write 258
Mixed 181
SusWrite 248
61% 275 MB/s
4K Read 26.8
4K Write 63.6
4K Mixed 27.1
109% 39.2 MB/s
DQ Read 317
DQ Write 247
DQ Mixed 75.8
113% 213 MB/s
163GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 228 182 250 236 201 228 MB/s
71.1% Very good
Read 469
Write 92.8
Mixed 132
SusWrite 221
50% 229 MB/s
4K Read 24.2
4K Write 49.4
4K Mixed 23.3
93% 32.3 MB/s
DQ Read 373
DQ Write 107
DQ Mixed 74.3
98% 185 MB/s
203GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 220 241 249 253 245 247 MB/s
70.6% Very good
Read 418
Write 251
Mixed 172
SusWrite 242
60% 271 MB/s
4K Read 20.5
4K Write 50.9
4K Mixed 22.4
87% 31.3 MB/s
DQ Read 320
DQ Write 250
DQ Mixed 82
116% 217 MB/s
152GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 99 86 79 88 103 121 MB/s
60.9% Good
Read 416
Write 126
Mixed 130
SusWrite 95.8
42% 192 MB/s
4K Read 31
4K Write 54
4K Mixed 22.1
104% 35.7 MB/s
DQ Read 199
DQ Write 135
DQ Mixed 67.6
77% 134 MB/s
42GB free (System drive)
Firmware: EXT49D0Q
SusWrite @10s intervals: 83 56 44 40 42 44 MB/s
58.4% Above average
Read 458
Write 245
Mixed 138
SusWrite 51.3
49% 223 MB/s
4K Read 25.9
4K Write 52.4
4K Mixed 19.4
92% 32.6 MB/s
DQ Read 307
DQ Write 124
DQ Mixed 66.9
89% 166 MB/s
100GB free (System drive)
Firmware: EXT4
SusWrite @10s intervals: 153 146 149 150 144 145 MB/s
57.8% Above average
Read 355
Write 220
Mixed 178
SusWrite 148
50% 225 MB/s
4K Read 26.1
4K Write 39.2
4K Mixed 24.3
91% 29.9 MB/s
DQ Read 116
DQ Write 177
DQ Mixed 67.9
74% 120 MB/s
4,180 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 26,404,771 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 5,349 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 12%
Tree trunk
Desktop
Desktop 52%
Yacht
Workstation
Workstation 31%
Sail boat

System: Dell Latitude E7440

CPU
Core i7-4600UIntelBench 56%, 16,769 samples2,266x
Core i5-4310UIntelBench 55%, 8,369 samples1,637x
Core i5-4300UIntelBench 54%, 23,770 samples1,181x
GPU
HD 4400 (Mobile 1.0/1.1 GHz)IntelBench 2%, 230,663 samples5,343x
Iris Pro Graphics 5200IntelBench 2%, 5 samples2x
GTX 1070Nvidia  $415Bench 78%, 846,070 samples2x
SSD
PM851 mSATA 256GBSamsungBench 67%, 4,180 samples967x
RAM
M471B1G73DB0-YK0 1x8GBSamsungBench 28%, 28,973 samples318x
HMT451S6BFR8A-PB 2x4GBHynixBench 47%, 27,327 samples270x
M471B5173DB0-YK0 2x4GBSamsungBench 47%, 20,434 samples215x
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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) May 2020 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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 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?
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What is sequential write speed?
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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 $165Nvidia GTX 1660S (Super) $230Crucial MX500 250GB $49
Intel Core i5-9600K $199Nvidia GTX 1650S (Super) $160Samsung 850 Evo 120GB $78
Intel Core i7-9700K $370Nvidia RTX 2070S (Super) $500Samsung 860 Evo 250GB $56
HDDRAMUSB
Seagate Barracuda 1TB (2016) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $75SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $75SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $681SanDisk Ultra Fit 32GB $16
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