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Samsung

PM851 mSATA 256GB

▲ 514 ▼

Release date ≈ Q2 2014.

VS

Average Bench: 67.6% (609th of 1003)

Based on 2,484 user benchmarks.  Models: SAMSUNG SSD PM851 mSATA 256GB, SAMSUNG SSD PM851 mSATA
Poor: 45%Average: 67.6% Great: 87%

Popular builds with this SSD

Above average average bench

The Samsung PM851 mSATA 256GB averaged 32.4% 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 307MB/s
Avg. 4K Random Read Speed 23MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 256GB is 41.6%. 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 160MB/s
Avg. Sustained Write Speed 187MB/s
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Average Bench

(Based on 2,484 samples)
Rank 60967.6%
Min Avg Max
324 Read 420 489
49.8 Write 203 262
86.5 Mixed 160 198
46 SusWrite 187 254
53.7% 243 MB/s
Min Avg Max
11.2 4K Read 23 34.2
24.2 4K Write 56.8 87.6
14 4K Mixed 22.5 29.7
93.8% 34.1 MB/s
Min Avg Max
142 DQ Read 307 372
55.8 DQ Write 190 256
47 DQ Mixed 72.1 84.1
101% 189 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
135GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 187 194 183 167 169 180 MB/s
91.3% Outstanding
Read 506
Write 252
Mixed 190
SusWrite 180
62% 282 MB/s
4K Read 38.9
4K Write 101
4K Mixed 33.8
156% 57.8 MB/s
DQ Read 368
DQ Write 237
DQ Mixed 82.7
121% 229 MB/s
201GB free (System drive)
Firmware: EXT49D0Q
SusWrite @10s intervals: 214 244 251 251 252 251 MB/s
83.6% Excellent
Read 473
Write 255
Mixed 182
SusWrite 244
64% 288 MB/s
4K Read 29
4K Write 81.4
4K Mixed 27.5
122% 46 MB/s
DQ Read 333
DQ Write 253
DQ Mixed 82.1
119% 223 MB/s
70GB free
Firmware: EXT4AD0Q
SusWrite @10s intervals: 167 157 148 182 159 249 MB/s
72.3% Very good
Read 459
Write 128
Mixed 176
SusWrite 177
52% 235 MB/s
4K Read 25.4
4K Write 68.9
4K Mixed 26.9
110% 40.4 MB/s
DQ Read 279
DQ Write 164
DQ Mixed 67.1
91% 170 MB/s
129GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 172 157 199 176 190 204 MB/s
69.9% Good
Read 445
Write 217
Mixed 143
SusWrite 183
54% 247 MB/s
4K Read 26.6
4K Write 60.8
4K Mixed 20.7
99% 36 MB/s
DQ Read 333
DQ Write 183
DQ Mixed 83.2
109% 200 MB/s
196GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 244 242 231 239 223 163 MB/s
67.6% Good
Read 440
Write 250
Mixed 138
SusWrite 224
58% 263 MB/s
4K Read 18.5
4K Write 39.9
4K Mixed 20.3
75% 26.2 MB/s
DQ Read 351
DQ Write 248
DQ Mixed 79.2
119% 226 MB/s
202GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 98 95 92 88 92 87 MB/s
66.1% Good
Read 477
Write 97.4
Mixed 124
SusWrite 91.8
43% 197 MB/s
4K Read 28.5
4K Write 57.6
4K Mixed 23.6
104% 36.6 MB/s
DQ Read 333
DQ Write 125
DQ Mixed 71.6
94% 176 MB/s
2,484 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 15,197,672 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 3,272 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 13%
Tree trunk
Desktop
Desktop 42%
Speed boat
Workstation
Workstation 23%
Surfboard

System: Dell Latitude E7440

CPU
Core i7-4600UIntelBench 41%, 12,151 samples1,430x
Core i5-4310UIntelBench 39%, 4,705 samples922x
Core i5-4300UIntelBench 38%, 15,917 samples765x
GPU
HD 4400 (Mobile 1.0/1.1 GHz)IntelBench 4%, 163,105 samples3,267x
Iris Pro Graphics 5200IntelBench 4%, 5 samples2x
GTX 1070Nvidia  $335Bench 98%, 663,441 samples2x
SSD
PM851 mSATA 256GBSamsungBench 68%, 2,484 samples636x
RAM
M471B1G73DB0-YK0 1x8GBSamsungBench 28%, 22,159 samples198x
HMT451S6BFR8A-PB 2x4GBHynixBench 48%, 19,734 samples159x
HMT41GS6AFR8A-PB 1x8GBHynixBench 28%, 10,525 samples137x
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Popular PM851 mSATA 256GB systems:

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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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Solid State Drive Rankings (Price vs Performance) June 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?
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?
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ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i7-8700K $350Nvidia GTX 1070 $335Samsung 850 Evo 250GB $101
AMD Ryzen 5 2600 $144Nvidia GTX 1060-6GB $230Samsung 850 Evo 500GB $100
AMD Ryzen 7 2700X $280Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $97
HDDRAMUSB
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $78SanDisk Extreme 64GB $45
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $646SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $43Corsair Vengeance LPX DDR4 3200 C16 2x8GB $75SanDisk Ultra Fit 32GB $12
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