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Pm991

NVMe Samsung 128GB

▲ 500 ▼

Release date ≈ Q1 2020.

Average Bench: 106% (229th of 1072)

Based on 671 user benchmarks.  Model: PM991 NVMe Samsung 128GB
Poor: 57%Average: 106% Great: 163%

Popular builds with this SSD

Outstanding average bench

The Pm991 NVMe Samsung 128GB averaged 6.0% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Pm991 NVMe Samsung 128GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 269MB/s
Avg. Sequential Read Speed 925MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Pm991 NVMe Samsung 128GB is 106%. This is a particularly wide range which indicates that the Pm991 NVMe Samsung 128GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 136MB/s
Avg. Sequential Write Speed 326MB/s
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Average Bench

(Based on 671 samples)
Rank 229106%
Min Avg Max
454 Read 925 1,312
70.4 Write 326 928
126 Mixed 361 942
64.5 SusWrite 136 218
95.6% 437 MB/s
Min Avg Max
16.7 4K Read 38.4 52
34.1 4K Write 86.8 136
17.8 4K Mixed 39.8 69.3
155% 55 MB/s
Min Avg Max
168 DQ Read 332 506
69.3 DQ Write 271 787
82.7 DQ Mixed 269 565
210% 291 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
27GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 31 35 35 39 45 45 MB/s
413% Outstanding
Read 4,973
Write 40.2
Mixed 75.2
SusWrite 38.2
266% 1,282 MB/s
4K Read 524
4K Write 1.8
4K Mixed 4
801% 177 MB/s
44GB free (System drive)
Firmware: 25306039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 112 97 105 80 98 99 MB/s
101% Outstanding
Read 957
Write 115
Mixed 208
SusWrite 98.6
74% 345 MB/s
4K Read 34.3
4K Write 107
4K Mixed 38.4
158% 59.9 MB/s
DQ Read 285
DQ Write 115
DQ Mixed 171
134% 190 MB/s
7GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 67 56 55 52 54 52 MB/s
95.1% Outstanding
Read 1,060
Write 83.2
Mixed 132
SusWrite 55.9
71% 333 MB/s
4K Read 33.4
4K Write 75.7
4K Mixed 34.7
135% 47.9 MB/s
DQ Read 285
DQ Write 74.1
DQ Mixed 117
102% 159 MB/s
21GB free (System drive)
Firmware: 25304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 81 72 70 74 72 69 MB/s
29.1% Poor
Read 388
Write 101
Mixed 130
SusWrite 72.7
38% 173 MB/s
4K Read 10.6
4K Write 7.6
4K Mixed 7.7
30% 8.63 MB/s
671 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 75,704,916 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 NVMe Samsung 128GB Builds (Compare 580 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 6%
Tree trunk
Desktop
Desktop 56%
Gunboat
Workstation
Workstation 6%
Tree trunk

System: Dell Latitude 3310

CPU
Core i3-8145UIntelBench 53%, 15,431 samples293x
Core i5-8265UIntelBench 53%, 87,841 samples218x
Pentium 5405UIntelBench 48%, 2,193 samples41x
GPU
UHD Graphics 620IntelBench 5%, 178,291 samples511x
UHD Graphics 610IntelBench 2%, 3,878 samples69x
SSD
NVMe Samsung 128GBPm991Bench 106%, 671 samples1x
RAM
HMAA1GS6CJR6N-XN 1x8GBUnknownBench 32%, 13,137 samples116x
HMA81GS6DJR8N-VK 1x8GBUnknownBench 39%, 886 samples43x
HMA81GS6CJR8N-VK 1x8GBUnknownBench 41%, 10,071 samples33x
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Popular NVMe Samsung 128GB systems:

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Welcome to our 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 value for money upgrades.

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Solid State Drive Rankings (Price vs Performance) April 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.

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Speed Comparisons

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1072 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

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 $273Nvidia RTX 4060 $295Crucial MX500 250GB $40
Intel Core i5-12400F $133Nvidia RTX 4060-Ti $385Samsung 850 Evo 120GB $80
Intel Core i5-12600K $178Nvidia RTX 4070 $539Samsung 860 Evo 250GB $52
HDDRAMUSB
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $40SanDisk Extreme 64GB $72
WD Blue 1TB (2012) $37Corsair Vengeance LPX DDR4 3000 C15 2x8GB $43SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $51G.SKILL Trident Z DDR4 3200 C14 4x16GB $351SanDisk Ultra Fit 32GB $16
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