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Samsung

PM851 mSATA 256GB

▲ 514 ▼

Release date ≈ Q2 2014.

Average Bench: 67% (650th of 1016)

Based on 3,573 user benchmarks.  Models: SAMSUNG SSD PM851 mSATA 256GB, SAMSUNG SSD PM851 mSATA
Poor: 45%Average: 67% Great: 84%

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 319MB/s
Avg. 4K-64Thread Mixed IO Speed 72.5MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 256GB is 39.6%. 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 188MB/s
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Average Bench

(Based on 3,573 samples)
Rank 65067%
Min Avg Max
330 Read 415 484
54.5 Write 205 262
88.8 Mixed 161 192
46.4 SusWrite 188 252
53.7% 243 MB/s
Min Avg Max
11.2 4K Read 22.3 32.8
25.2 4K Write 54.6 83.4
13.6 4K Mixed 22.1 28.8
91% 33 MB/s
Min Avg Max
148 DQ Read 319 371
52.3 DQ Write 193 257
46 DQ Mixed 72.5 83.8
103% 195 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
170GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 230 215 228 231 252 251 MB/s
79.9% Very good
Read 423
Write 258
Mixed 180
SusWrite 234
61% 274 MB/s
4K Read 27.2
4K Write 74.7
4K Mixed 27.1
116% 43 MB/s
DQ Read 364
DQ Write 257
DQ Mixed 80
122% 234 MB/s
170GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 247 248 246 251 251 252 MB/s
77.1% Very good
Read 410
Write 244
Mixed 183
SusWrite 249
60% 271 MB/s
4K Read 25.7
4K Write 64.5
4K Mixed 26.1
106% 38.8 MB/s
DQ Read 344
DQ Write 248
DQ Mixed 72.1
114% 221 MB/s
50GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 148 195 208 206 213 203 MB/s
69.1% Good
Read 390
Write 113
Mixed 105
SusWrite 195
44% 201 MB/s
4K Read 28.2
4K Write 68.8
4K Mixed 21.3
106% 39.4 MB/s
DQ Read 327
DQ Write 125
DQ Mixed 77.6
96% 176 MB/s
180GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 215 207 198 197 187 189 MB/s
67.2% Good
Read 425
Write 118
Mixed 163
SusWrite 199
50% 226 MB/s
4K Read 21.8
4K Write 51.2
4K Mixed 22.4
89% 31.8 MB/s
DQ Read 303
DQ Write 192
DQ Mixed 78.9
104% 191 MB/s
205GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 236 247 251 257 256 255 MB/s
65.2% Good
Read 422
Write 263
Mixed 189
SusWrite 250
63% 281 MB/s
4K Read 17.9
4K Write 30.2
4K Mixed 19.1
68% 22.4 MB/s
DQ Read 292
DQ Write 257
DQ Mixed 85.7
116% 212 MB/s
214GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 223 245 250 250 249 251 MB/s
57.8% Above average
Read 354
Write 258
Mixed 176
SusWrite 245
58% 258 MB/s
4K Read 12
4K Write 34
4K Mixed 14.9
55% 20.3 MB/s
DQ Read 277
DQ Write 254
DQ Mixed 67
105% 199 MB/s
3,573 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 21,681,288 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 4,547 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%, 14,830 samples1,951x
Core i5-4310UIntelBench 38%, 7,304 samples1,356x
Core i5-4300UIntelBench 37%, 20,062 samples1,013x
GPU
HD 4400 (Mobile 1.0/1.1 GHz)IntelBench 2%, 187,564 samples4,542x
Iris Pro Graphics 5200IntelBench 2%, 5 samples2x
GTX 1070Nvidia  $346Bench 78%, 703,911 samples2x
SSD
PM851 mSATA 256GBSamsungBench 67%, 3,573 samples849x
RAM
M471B1G73DB0-YK0 1x8GBSamsungBench 29%, 25,919 samples278x
HMT451S6BFR8A-PB 2x4GBHynixBench 48%, 24,538 samples220x
M471B5173DB0-YK0 2x4GBSamsungBench 48%, 17,510 samples178x
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Popular PM851 mSATA 256GB systems:

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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.
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  • - Reports are generated and presented on userbenchmark.com.
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Solid State Drive Rankings (Price vs Performance) January 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?
What’s the difference between SATA, PCIe and NVMe?
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What is sequential read speed?
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ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i5-9600K $218Nvidia GTX 1660S (Super) $240Crucial MX500 250GB $43
Intel Core i5-9400F $155Nvidia GTX 1650S (Super) $170Samsung 850 Evo 120GB $78
Intel Core i7-9700K $370Nvidia RTX 2060 $340Samsung 850 Pro 512GB $204
HDDRAMUSB
Seagate Barracuda 1TB (2016) $37Corsair Vengeance LPX DDR4 3200 C16 2x8GB $73SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $40Corsair Vengeance LPX DDR4 3000 C15 2x8GB $63SanDisk Extreme 32GB $46
Seagate Barracuda 3TB (2016) $85G.SKILL Trident Z DDR4 3200 C14 4x16GB $643SanDisk Ultra Fit 32GB $16
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