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Samsung

PM851 mSATA 512GB

▲ 501 ▼

Release date ≈ Q2 2014.

Average Bench: 69% (685th of 1072)

Based on 958 user benchmarks.  Model: SAMSUNG SSD PM851 mSATA 512GB
Poor: 44%Average: 69% Great: 90%

Popular builds with this SSD

Above average average bench

The Samsung PM851 mSATA 512GB averaged 30.9% 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 320MB/s
Avg. 4K-64Thread Mixed IO Speed 78MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 mSATA 512GB is 46.4%. This is a relatively wide range which indicates that the Samsung PM851 mSATA 512GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sequential Mixed IO Speed 153MB/s
Avg. Sustained Write Speed 227MB/s
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Average Bench

(Based on 958 samples)
Rank 68569%
Min Avg Max
314 Read 420 491
54.1 Write 241 362
89.6 Mixed 153 198
48.6 SusWrite 227 354
57.7% 260 MB/s
Min Avg Max
11.3 4K Read 22.4 30.9
22.6 4K Write 49.6 79.4
13.9 4K Mixed 23.9 32.5
90.9% 32 MB/s
Min Avg Max
135 DQ Read 320 372
50.4 DQ Write 159 222
48.9 DQ Mixed 78 90.5
101% 186 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
30GB free
Firmware: AD0Q
SusWrite @10s intervals: 352 339 334 349 360 358 MB/s
82.5% Excellent
Read 382
Write 344
Mixed 218
SusWrite 349
72% 323 MB/s
4K Read 25.4
4K Write 61.3
4K Mixed 28.3
107% 38.3 MB/s
DQ Read 369
DQ Write 222
DQ Mixed 87.6
121% 226 MB/s
434GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 237 301 284 292 342 349 MB/s
71.9% Very good
Read 309
Write 145
Mixed 119
SusWrite 301
49% 219 MB/s
4K Read 19.2
4K Write 62.3
4K Mixed 28.3
98% 36.6 MB/s
DQ Read 277
DQ Write 205
DQ Mixed 83.1
105% 188 MB/s
213GB free (System drive)
Firmware: EXT48D0Q
SusWrite @10s intervals: 238 235 250 238 239 206 MB/s
71.8% Very good
Read 417
Write 252
Mixed 156
SusWrite 234
59% 265 MB/s
4K Read 24.2
4K Write 42.3
4K Mixed 25.7
92% 30.7 MB/s
DQ Read 356
DQ Write 207
DQ Mixed 88.2
118% 217 MB/s
322GB free (System drive)
Firmware: EXT49D0Q
SusWrite @10s intervals: 234 320 216 195 302 241 MB/s
50.3% Above average
Read 367
Write 137
Mixed 133
SusWrite 251
49% 222 MB/s
4K Read 13.9
4K Write 19
4K Mixed 14.5
50% 15.8 MB/s
DQ Read 130
DQ Write 90.8
DQ Mixed 68.2
62% 96.3 MB/s
212GB free (System drive)
Firmware: EXT4AD0Q
SusWrite @10s intervals: 46 38 40 27 36 36 MB/s
39.9% Below average
Read 369
Write 48.1
Mixed 59.8
SusWrite 37.2
28% 128 MB/s
4K Read 13.5
4K Write 31.3
4K Mixed 10.1
50% 18.3 MB/s
DQ Read 307
DQ Write 57.1
DQ Mixed 48.7
70% 138 MB/s
958 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 73,436,901 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 512GB Builds (Compare 1,022 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 28%
Raft
Desktop
Desktop 102%
UFO
Workstation
Workstation 29%
Raft

System: Dell XPS 15 9530

CPU
Core i7-13700HIntelBench 104%, 4,321 samples351x
Core i9-13900HIntelBench 107%, 3,416 samples304x
Core i7-4712HQIntelBench 61%, 5,396 samples251x
GPU
Iris Xe GraphicsIntelBench 19%, 8,930 samples384x
HD 4600 (Mobile 1.15 GHz)IntelBench 3%, 258,091 samples248x
GeForce GT 750MNvidiaBench 8%, 13,088 samples119x
SSD
PM851 mSATA 512GBSamsungBench 69%, 958 samples1x
RAM
HMCG78AEBSA095N 2x16GBUnknownBench 137%, 888 samples151x
M425R1GB4BB0-CQKOL 2x8GBUnknownBench 122%, 4,457 samples102x
HMCG78MEBSA095N 2x16GBUnknownBench 129%, 3,160 samples92x
EDIT WITH CUSTOM PC BUILDER

Popular PM851 mSATA 512GB systems:

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute

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
  • - RAM tests include: single/multi core bandwidth and latency
  • - SkillBench (space shooter) tests user input accuracy
  • - Reports are generated and presented on userbenchmark.com
  • - Identify the strongest components in your PC
  • - See speed test results from other users
  • - Compare your components to the current market leaders
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Solid State Drive Rankings (Price vs Performance) December 2023 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?
How is the AS SSD total score calculated?
ALL FAQs »

 Best User Rated
The Best.
CPUGPUSSD
Intel Core i5-13600K $270Nvidia RTX 4060 $295Crucial MX500 250GB $30
Intel Core i5-12400F $146Nvidia RTX 4060-Ti $360Samsung 850 Evo 120GB $80
Intel Core i5-12600K $189Nvidia RTX 3060-Ti $340Samsung 860 Evo 250GB $49
HDDRAMUSB
Seagate Barracuda 1TB (2016) $40Corsair Vengeance LPX DDR4 3200 C16 2x8GB $42SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $30Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $50G.SKILL Trident Z DDR4 3200 C14 4x16GB $357SanDisk Ultra Fit 32GB $16
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