TEST
YOUR USB

Samsung (ExtHD)

SSD 850 PRO 512G 512GB

▲ 500 ▼

Release date ≈ Q4 2017.

Average Bench: 119% (3rd of 639)

Based on 7 user benchmarks.  Device: VID 1f75 PID 0621 Model: Samsung SSD 850 PRO 512G
Poor: 31%Average: 119% Great: 175%

Outstanding average bench

The Samsung SSD 850 PRO 512G 512GB averaged 19.1% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Samsung SSD 850 PRO 512G 512GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Write Speed 32.3MB/s
Avg. 4K-64Thread Mixed IO Speed 24MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Samsung SSD 850 PRO 512G 512GB is 144%. This is a particularly wide range which indicates that the Samsung SSD 850 PRO 512G 512GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sequential Read Speed 191MB/s
Avg. Sustained Write Speed 105MB/s
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Average Bench

(Based on 7 samples)
Rank 3119%
Min Avg Max
28.3 Read 191 253
5 Write 134 244
26.6 Mixed 151 243
25.8 SusWrite 105 236
189% 145 MB/s
Min Avg Max
6 4K Read 17.6 23.4
3.4 4K Write 19.5 28.5
7.4 4K Mixed 16.7 23.2
1,297% 17.9 MB/s
Min Avg Max
21.1 DQ Read 24 26.6
26.6 DQ Write 32.3 37.6
13.2 DQ Mixed 24 30.3
2,004% 26.8 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
307GB free, PID 0621
Operating at USB 3.0 Speed
175% Outstanding
Read 253
Write 244
Mixed 243
316% 246 MB/s
4K Read 23.4
4K Write 26
4K Mixed 12.7
1,404% 20.7 MB/s
DQ Read 25
DQ Write 26.6
DQ Mixed 13.2
1,446% 21.6 MB/s
291GB free, PID 0621
Operating at USB 3.0 Speed
SusWrite @10s intervals: 230 234 235 240 239 237 MB/s
167% Outstanding
Read 246
Write 234
Mixed 224
SusWrite 236
320% 235 MB/s
4K Read 23.3
4K Write 24.3
4K Mixed 23.2
1,702% 23.6 MB/s
DQ Read 26.6
DQ Write 37.6
DQ Mixed 30.3
2,408% 31.5 MB/s
251GB free, PID 0621
Operating at USB 3.0 Speed
SusWrite @10s intervals: 184 188 190 123 55 66 MB/s
148% Outstanding
Read 251
Write 130
Mixed 152
SusWrite 134
209% 167 MB/s
4K Read 22.1
4K Write 25.1
4K Mixed 22.2
1,691% 23.1 MB/s
DQ Read 24.9
DQ Write 36.5
DQ Mixed 27.1
2,256% 29.5 MB/s
477GB free, PID 0621
Operating at USB 3.0 Speed
SusWrite @10s intervals: 98 104 104 103 104 103 MB/s
130% Outstanding
Read 104
Write 5
Mixed 102
SusWrite 103
102% 78.6 MB/s
4K Read 19
4K Write 28.5
4K Mixed 22.2
1,795% 23.2 MB/s
DQ Read 21.1
DQ Write 29.3
DQ Mixed 23.9
1,888% 24.8 MB/s
477GB free, PID 0621
Operating at USB 3.0 Speed
SusWrite @10s intervals: 87 46 54 69 83 106 MB/s
126% Outstanding
Read 245
Write 107
Mixed 139
SusWrite 74.3
169% 141 MB/s
4K Read 18.1
4K Write 22.8
4K Mixed 19.1
1,492% 20 MB/s
DQ Read 22.5
DQ Write 31.6
DQ Mixed 25.4
2,022% 26.5 MB/s
107GB free, PID 0621
Operating at USB 3.0 Speed
SusWrite @10s intervals: 76 98 43 45 45 44 MB/s
56.1% Above average
Read 209
Write 194
Mixed 172
SusWrite 58.6
205% 158 MB/s
4K Read 11
4K Write 3.4
4K Mixed 10
497% 8.13 MB/s
10GB free, PID 0621
Operating at USB 2.1 Speed
SusWrite @10s intervals: 25 26 26 26 26 26 MB/s
31.1% Below average
Read 28.3
Write 25.9
Mixed 26.6
SusWrite 25.8
36% 26.6 MB/s
4K Read 6
4K Write 6.5
4K Mixed 7.4
495% 6.63 MB/s
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  • Fastest real world speed - Real World Speed measures performance for typical consumers.

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