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Samsung

PM851 mSATA 256GB

▲ 513 ▼

Release date ≈ Q2 2014.

VS

Average Bench: 67.4% (566th of 970)

Based on 1,585 user benchmarks.  Models: SAMSUNG SSD PM851 mSATA 256GB, SAMSUNG SSD PM851 mSATA
Poor: 43%Average: 67.4% Great: 86%

Popular builds with this SSD

Above average average bench

The Samsung PM851 mSATA 256GB averaged 32.6% 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 298MB/s
Avg. 4K Random Read Speed 23.4MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 256GB is 43.3%. 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 175MB/s
Avg. Sustained Write Speed 190MB/s
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Average Bench

(Based on 1,585 samples)
Rank 56667.4%
Min Avg Max
337 Read 428 501
48.6 Write 208 262
88.4 Mixed 175 334
45.5 SusWrite 190 253
55.4% 250 MB/s
Min Avg Max
11.6 4K Read 23.4 33.7
23.2 4K Write 56.8 95.1
9.97 4K Mixed 21.3 29.9
92.9% 33.9 MB/s
Min Avg Max
27 DQ Read 298 373
55.9 DQ Write 189 257
13.6 DQ Mixed 66.8 83.8
97.4% 185 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
233GB free
Firmware: EXT49D0Q
SusWrite @10s intervals: 257 256 257 256 256 256 MB/s
78.1% Very good
Read 447
Write 257
Mixed 183
SusWrite 256
64% 286 MB/s
4K Read 23.8
4K Write 67.4
4K Mixed 23.8
102% 38.3 MB/s
DQ Read 366
DQ Write 254
DQ Mixed 85.1
124% 235 MB/s
80GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 214 223 231 232 232 230 MB/s
73.5% Very good
Read 447
Write 238
Mixed 167
SusWrite 227
60% 270 MB/s
4K Read 24
4K Write 63
4K Mixed 24.4
101% 37.1 MB/s
DQ Read 275
DQ Write 227
DQ Mixed 70.7
102% 191 MB/s
51GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 194 150 117 110 101 96 MB/s
72.6% Very good
Read 488
Write 222
Mixed 190
SusWrite 128
56% 257 MB/s
4K Read 27.1
4K Write 61.2
4K Mixed 25.9
107% 38.1 MB/s
DQ Read 366
DQ Write 217
DQ Mixed 79.2
116% 221 MB/s
82GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 158 137 149 166 160 167 MB/s
71.2% Very good
Read 439
Write 204
Mixed 160
SusWrite 156
53% 240 MB/s
4K Read 30.7
4K Write 58.9
4K Mixed 25.6
110% 38.4 MB/s
DQ Read 294
DQ Write 195
DQ Mixed 79.7
104% 190 MB/s
166GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 239 244 241 208 192 180 MB/s
67.9% Good
Read 429
Write 260
Mixed 156
SusWrite 217
59% 266 MB/s
4K Read 18.8
4K Write 47.9
4K Mixed 22.8
83% 29.8 MB/s
DQ Read 298
DQ Write 236
DQ Mixed 82.8
112% 206 MB/s
7GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 49 37 34 35 31 29 MB/s
48.7% Average
Read 292
Write 70.2
Mixed 82
SusWrite 35.8
26% 120 MB/s
4K Read 29.4
4K Write 41.7
4K Mixed 27.4
102% 32.8 MB/s
DQ Read 106
DQ Write 54.3
DQ Mixed 66.3
53% 75.4 MB/s
102GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 39 30 37 40 37 45 MB/s
42.8% Average
Read 362
Write 33.3
Mixed 67.5
SusWrite 37.9
27% 125 MB/s
4K Read 8.3
4K Write 29.8
4K Mixed 21.9
56% 20 MB/s
DQ Read 309
DQ Write 33.7
DQ Mixed 35
60% 126 MB/s
1,585 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 10,240,601 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 2,176 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 13%
Tree trunk
Desktop
Desktop 41%
Speed boat
Workstation
Workstation 23%
Surfboard

System: Dell Latitude E7440

CPU
Core i7-4600UIntelBench 41%, 7,914 samples951x
Core i5-4310UIntelBench 38%, 3,309 samples596x
Core i5-4300UIntelBench 38%, 12,026 samples530x
GPU
HD 4400 (Mobile 1.0/1.1 GHz)IntelBench 4%, 131,895 samples2,173x
GTX 1070Nvidia  $335Bench 98%, 446,884 samples1x
GTX 970Nvidia  $200Bench 64%, 340,365 samples1x
SSD
PM851 mSATA 256GBSamsungBench 67%, 1,585 samples432x
RAM
M471B1G73DB0-YK0 1x8GBSamsungBench 28%, 16,321 samples140x
HMT41GS6AFR8A-PB 1x8GBHynixBench 28%, 8,600 samples106x
HMT451S6BFR8A-PB 2x4GBHynixBench 48%, 15,933 samples104x
EDIT WITH CUSTOM PC BUILDER

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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Solid State Drive Rankings (Price vs Performance) December 2018 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?
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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ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i7-8700K $365Nvidia GTX 1070 $335Samsung 850 Evo 250GB $67
AMD Ryzen 5 1600 $150Nvidia GTX 1060-6GB $240Samsung 850 Evo 500GB $98
Intel Core i5-8600K $250Nvidia GTX 1080-Ti $808Samsung 850 Pro 256GB $163
HDDRAMUSB
Seagate Barracuda 1TB (2016) $45Corsair Vengeance LPX DDR4 3000 C15 2x8GB $129SanDisk Extreme 64GB $43
Seagate Barracuda 3TB (2016) $82G.SKILL Trident Z DDR4 3200 C14 4x16GB $830SanDisk Extreme 32GB $48
WD Blue 1TB (2012) $45Corsair Vengeance LPX DDR4 3200 C16 2x8GB $140SanDisk Ultra Fit 32GB $12
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