TEST
YOUR USB

Samsung (ExtHD)

SSD 840 PRO Seri 256GB

▲ 500 ▼

Release date ≈ Q1 2018.

Average Bench: 53.7% (21st of 639)

Based on 8 user benchmarks.  Device: VID 152d PID 2329 Model: Samsung SSD 840 PRO Seri
Poor: 23%Average: 53.7% Great: 69%

Average average bench

The Samsung SSD 840 PRO Seri 256GB averaged 46.3% 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 Write Speed 19.5MB/s
Avg. 4K-64Thread Mixed IO Speed 13.7MB/s

Average consistency

The range of scores (95th - 5th percentile) for the Samsung SSD 840 PRO Seri 256GB is 46.6%. This is a relatively wide range which indicates that the Samsung SSD 840 PRO Seri 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sequential Read Speed 35.5MB/s
Avg. Sustained Write Speed 31.2MB/s
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Average Bench

(Based on 8 samples)
Rank 2153.7%
Min Avg Max
20.5 Read 35.5 41
20.3 Write 34.9 41.6
20.3 Mixed 34.8 41.2
4.3 SusWrite 31.2 42.4
46.5% 34.1 MB/s
Min Avg Max
5.1 4K Read 9.59 12.6
5.1 4K Write 12.8 16.8
4.2 4K Mixed 9.98 13.5
809% 10.8 MB/s
Min Avg Max
12 DQ Read 12.8 13.5
18.8 DQ Write 19.5 20.5
6.41 DQ Mixed 13.7 15.3
1,175% 15.3 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest USB (mainstream) averages a speed of 100%
71GB free, PID 2329
Operating at USB 2.0 Speed
SusWrite @10s intervals: 42 42 42 43 43 43 MB/s
69.2% Good
Read 41
Write 41.3
Mixed 40
SusWrite 42.4
56% 41.2 MB/s
4K Read 11.3
4K Write 16.7
4K Mixed 13.4
1,066% 13.8 MB/s
DQ Read 12.6
DQ Write 19.7
DQ Mixed 15.3
1,237% 15.9 MB/s
151GB free, PID 2329
Operating at USB 2.0 Speed
SusWrite @10s intervals: 42 42 41 41 42 42 MB/s
69% Good
Read 38.7
Write 39.1
Mixed 38.5
SusWrite 41.7
54% 39.5 MB/s
4K Read 11.2
4K Write 16.8
4K Mixed 13.1
1,058% 13.7 MB/s
DQ Read 13
DQ Write 19.6
DQ Mixed 15.3
1,235% 16 MB/s
124GB free, PID 2329
Operating at USB 2.0 Speed
SusWrite @10s intervals: 32 32 32 32 32 32 MB/s
66.1% Good
Read 33.3
Write 31.7
Mixed 32.3
SusWrite 32.1
44% 32.3 MB/s
4K Read 12.6
4K Write 16.7
4K Mixed 13.5
1,074% 14.3 MB/s
DQ Read 13.4
DQ Write 20.5
DQ Mixed 15.3
1,267% 16.4 MB/s
34GB free, PID 2329
Operating at USB 2.0 Speed
SusWrite @10s intervals: 38 36 38 38 38 38 MB/s
62% Good
Read 37.5
Write 38.2
Mixed 37.4
SusWrite 37.6
52% 37.7 MB/s
4K Read 10.9
4K Write 14.9
4K Mixed 12.1
959% 12.6 MB/s
DQ Read 13.5
DQ Write 18.8
DQ Mixed 14.9
1,196% 15.7 MB/s
86GB free (System drive), PID 2329
Operating at USB 2.0 Speed
SusWrite @10s intervals: 39 41 40 41 39 38 MB/s
57.8% Above average
Read 39
Write 39
Mixed 38.5
SusWrite 39.9
54% 39.1 MB/s
4K Read 9.6
4K Write 13.4
4K Mixed 10.7
855% 11.2 MB/s
DQ Read 12.4
DQ Write 19.5
DQ Mixed 14.8
1,213% 15.6 MB/s
236GB free, PID 2329
Operating at USB 2.0 Speed
56.4% Above average
Read 40.8
Write 41.6
Mixed 41.2
53% 41.2 MB/s
4K Read 9.96
4K Write 12.7
4K Mixed 7.02
708% 9.9 MB/s
DQ Read 12
DQ Write 18.8
DQ Mixed 6.41
904% 12.4 MB/s
215GB free, PID 2329
Operating at USB 2.0 Speed
SusWrite @10s intervals: 20 21 21 20 21 21 MB/s
26.4% Poor
Read 20.5
Write 20.3
Mixed 20.3
SusWrite 20.5
28% 20.4 MB/s
4K Read 6.1
4K Write 5.7
4K Mixed 5.8
414% 5.87 MB/s
37GB free, PID 2329
Operating at USB 2.0 Speed
SusWrite @10s intervals: 4 4.4 4.3 4.5 4.4 4.1 MB/s
22.6% Poor
Read 33
Write 28
Mixed 30
SusWrite 4.3
30% 23.8 MB/s
4K Read 5.1
4K Write 5.1
4K Mixed 4.2
335% 4.8 MB/s
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