Average Bench: 59.1% (591st of 921)

Based on 639 user benchmarks.  Models: SAMSUNG SSD PM851 2.5 7mm 256GB, SAMSUNG SSD PM851 2.5 7m

Average average bench

The Samsung PM851 2.5 7mm 256GB averaged 40.9% 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 Random Read Speed 22.7MB/s
Avg. Sequential Read Speed 477MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung PM851 2.5 7mm 256GB is 36.5%. This is a relatively wide range which indicates that the Samsung PM851 2.5 7mm 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K-64Thread Mixed IO Speed 24.8MB/s
Avg. Sequential Write Speed 171MB/s
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Average Bench

(Based on 639 samples)
Min Avg Max
356 Read 477 514
37 Write 171 260
70.3 Mixed 235 345
64.3% 294 MB/s
Min Avg Max
14 4K Read 22.7 29.7
24.9 4K Write 52.7 91.9
7.66 4K Mixed 12.4 16
78.1% 29.3 MB/s
Min Avg Max
18.2 DQ Read 181 359
36.2 DQ Write 129 252
9.27 DQ Mixed 24.8 39.3
53.8% 112 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
95GB free
Firmware: EXT0
SYSTEM 4KALIGNED
Read 487
Write 256
Mixed 348
80% 364 MB/s
4K Read 24
4K Write 43.2
4K Mixed 12.5
75% 26.5 MB/s
DQ Read 355
DQ Write 235
DQ Mixed 37.3
97% 209 MB/s
121GB free
Firmware: EXT08D0Q Max speed: SATA 3.0 600 MB/s
SYSTEM NCQ 4KALIGNED SSD TRIM S.M.A.R.T
Read 507
Write 263
Mixed 335
81% 368 MB/s
4K Read 25.3
4K Write 76
4K Mixed 13.8
96% 38.4 MB/s
DQ Read 28.4
DQ Write 235
DQ Mixed 13.9
46% 92.5 MB/s
188GB free
Firmware: EXT08D0Q Max speed: SATA 3.0 600 MB/s
SYSTEM NCQ 4KALIGNED SSD TRIM S.M.A.R.T
Read 484
Write 243
Mixed 317
77% 348 MB/s
4K Read 18.7
4K Write 31.1
4K Mixed 13.6
62% 21.2 MB/s
DQ Read 178
DQ Write 181
DQ Mixed 36.7
67% 132 MB/s
76GB free
Firmware: EXT08D0Q Max speed: SATA 3.0 600 MB/s
SYSTEM NCQ 4KALIGNED SSD TRIM S.M.A.R.T
Read 501
Write 104
Mixed 188
57% 264 MB/s
4K Read 25.6
4K Write 61.4
4K Mixed 12.6
88% 33.2 MB/s
DQ Read 26.3
DQ Write 134
DQ Mixed 12.9
30% 57.7 MB/s
44GB free
Firmware: EXT08D0Q Max speed: SATA 3.0 600 MB/s
SYSTEM NCQ 4KALIGNED SSD TRIM S.M.A.R.T
Read 497
Write 38.7
Mixed 93
44% 210 MB/s
4K Read 22.9
4K Write 29.6
4K Mixed 9.34
62% 20.6 MB/s
DQ Read 23.5
DQ Write 45.6
DQ Mixed 13.2
16% 27.4 MB/s
41GB free
Firmware: EXT08D0Q Max speed: SATA 3.0 600 MB/s
SYSTEM NCQ 4KALIGNED SSD TRIM S.M.A.R.T
Read 462
Write 43.2
Mixed 79
41% 195 MB/s
4K Read 12.4
4K Write 20.3
4K Mixed 7.09
39% 13.3 MB/s
DQ Read 13.8
DQ Write 45.7
DQ Mixed 7.35
12% 22.3 MB/s
199GB free
Firmware: EXT08D0Q
4KALIGNED
Read 336
Write 93.6
Mixed 136
41% 188 MB/s
4K Read 0.08
4K Write 0.08
4K Mixed 0.13
0% 0.1 MB/s
639 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 6,466,514 SSDs tested.

Typical PM851 2.5 7mm 256GB Builds (Compare 1,491 builds) See popular component choices, score breakdowns and rankings.
Gaming
Gaming 14%
Tree trunk
Desktop
Desktop 53%
Yacht
Workstation
Workstation 34%
Sail boat

System: Dell Latitude E6540

EDIT WITH CUSTOM PC BUILDER Value: 52% - Above average Total price: $500

Popular PM851 2.5 7mm 256GB 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.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - 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 highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) April 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 - Sometimes benchmarks get it completely wrong...
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
  • Best value for money - Value for money is based on real world performance, price and capacity.
  • Raw speed comparison - Raw speed readings.
  • Details ordered by value - Detailed performance stats ordered by overall value for money.

 Comments

921 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different SSDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

 Best User Rated

The Best.
CPUGPUSSD
Intel Core i7-8700K $330Nvidia GTX 1070 $447Samsung 850 Evo 250GB $90
Intel Core i7-7700K $290Nvidia GTX 1060-6GB $290Samsung 850 Evo 500GB $136
AMD Ryzen 5 1600 $176AMD RX 480 $350Samsung 850 Pro 256GB $163
HDDRAMUSB
Seagate Barracuda 1TB (2016) $44Corsair Vengeance LPX DDR4 3000 C15 2x8GB $183SanDisk Extreme 64GB $70
Seagate Barracuda 3TB (2016) $75G.SKILL Trident Z DDR4 3200 C14 4x16GB $957SanDisk Extreme 32GB $46
Seagate Barracuda 2TB (2016) $36Corsair Vengeance LPX DDR4 3200 C16 2x8GB $193SanDisk Ultra Fit 32GB $12
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