Average Bench: 132% (177th of 1074)

Based on 1,958 user benchmarks.  Model: NVMe PM991a NVMe Samsung 512GB

Outstanding average bench

The Nvme PM991a Samsung 512GB averaged 32.4% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Nvme PM991a Samsung 512GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 390MB/s
Avg. 4K-64Thread Read Speed 658MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Nvme PM991a Samsung 512GB is 166%. This is a particularly wide range which indicates that the Nvme PM991a Samsung 512GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 392MB/s
Avg. 4K-64Thread Write Speed 283MB/s
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Average Bench

(Based on 1,958 samples)
Min Avg Max
580 Read 1,028 1,624
112 Write 632 1,688
181 Mixed 636 1,519
95.6 SusWrite 392 773
150% 672 MB/s
Min Avg Max
16.8 4K Read 34.2 54.8
27.2 4K Write 85.4 163
18.9 4K Mixed 41.9 77.9
151% 53.8 MB/s
Min Avg Max
221 DQ Read 658 1,274
89.9 DQ Write 283 989
132 DQ Mixed 390 1,063
310% 444 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
68GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 122 117 114 117 114 109 MB/s
Read 1,259
Write 141
Mixed 237
SusWrite 115
94% 438 MB/s
4K Read 39.8
4K Write 127
4K Mixed 44.7
185% 70.4 MB/s
DQ Read 866
DQ Write 105
DQ Mixed 161
200% 377 MB/s
260GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 134 144 139 136 139 135 MB/s
Read 1329
Write 180
Mixed 315
SusWrite 138
106% 490 MB/s
4K Read 35.8
4K Write 93.2
4K Mixed 44.2
160% 57.7 MB/s
DQ Read 861
DQ Write 130
DQ Mixed 255
248% 415 MB/s
82GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 137 156 134 143 123 129 MB/s
Read 1,112
Write 158
Mixed 290
SusWrite 137
92% 424 MB/s
4K Read 34.6
4K Write 76.8
4K Mixed 39.6
144% 50.3 MB/s
DQ Read 552
DQ Write 165
DQ Mixed 260
218% 326 MB/s
114GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 124 133 108 102 106 102 MB/s
Read 713
Write 123
Mixed 226
SusWrite 112
64% 294 MB/s
4K Read 30.2
4K Write 93
4K Mixed 39.9
146% 54.4 MB/s
DQ Read 779
DQ Write 145
DQ Mixed 200
214% 374 MB/s
250GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 134 130 114 132 103 147 MB/s
Read 753
Write 189
Mixed 430
SusWrite 127
82% 374 MB/s
4K Read 26.4
4K Write 82.3
4K Mixed 39.2
134% 49.3 MB/s
DQ Read 730
DQ Write 114
DQ Mixed 159
184% 335 MB/s
135GB free (System drive)
Firmware: 26300039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 178 128 110 111 109 97 MB/s
Read 736
Write 252
Mixed 353
SusWrite 122
80% 366 MB/s
4K Read 31.2
4K Write 84.7
4K Mixed 31.9
133% 49.3 MB/s
DQ Read 755
DQ Write 122
DQ Mixed 181
199% 353 MB/s
38GB free (System drive)
Firmware: 26303039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 73 55 46 47 45 45 MB/s
Read 754
Write 97.3
Mixed 166
SusWrite 51.7
57% 267 MB/s
4K Read 25.1
4K Write 68.7
4K Mixed 31.8
115% 41.9 MB/s
DQ Read 735
DQ Write 80.5
DQ Mixed 141
171% 319 MB/s
90GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 39 60 54 47 40 74 MB/s
Read 304
Write 72
Mixed 139
SusWrite 52.2
31% 142 MB/s
4K Read 13.8
4K Write 31.9
4K Mixed 19.5
63% 21.7 MB/s
DQ Read 192
DQ Write 78.5
DQ Mixed 54.8
62% 108 MB/s
1,958 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 75,944,656 SSDs tested

Typical PM991a Samsung 512GB Builds (Compare 10,221 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 124%
UFO
Desktop
Desktop 98%
Nuclear submarine
Workstation
Workstation 123%
UFO

System: Dell XPS 8940

EDIT WITH CUSTOM PC BUILDER Value: 96% - Outstanding Total price: $540

Popular PM991a Samsung 512GB systems:

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Solid State Drive Rankings (Price vs Performance) May 2024 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.

 Comments

1074 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

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