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Nvme

PM991a Samsung 128GB

▲ 500 ▼

Release date ≈ Q2 2021.

Average Bench: 127% (183rd of 1072)

Based on 50 user benchmarks.  Model: NVMe PM991a NVMe Samsung 128GB
Poor: 66%Average: 127% Great: 164%

Popular builds with this SSD

Outstanding average bench

The Nvme PM991a Samsung 128GB averaged 26.6% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Nvme PM991a Samsung 128GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 426MB/s
Avg. 4K-64Thread Read Speed 646MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Nvme PM991a Samsung 128GB is 97.8%. This is a particularly wide range which indicates that the Nvme PM991a Samsung 128GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 189MB/s
Avg. 4K-64Thread Write Speed 252MB/s
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Average Bench

(Based on 50 samples)
Rank 183127%
Min Avg Max
511 Read 1,057 3,430
36.9 Write 596 1,138
65.3 Mixed 587 1,189
26.1 SusWrite 189 294
134% 607 MB/s
Min Avg Max
13.2 4K Read 46.7 525
2.4 4K Write 88 150
4.5 4K Mixed 44.8 75.1
175% 59.8 MB/s
Min Avg Max
195 DQ Read 646 955
11.1 DQ Write 252 837
25 DQ Mixed 426 845
321% 441 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
70GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 37 44 37 33 34 34 MB/s
242% Outstanding
Read 1,465
Write 23.7
Mixed 82.4
SusWrite 36.3
84% 402 MB/s
4K Read 449
4K Write 2
4K Mixed 4.3
686% 152 MB/s
78GB free (System drive)
Firmware: 26300039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 486 186 207 205 224 224 MB/s
139% Outstanding
Read 1,134
Write 877
Mixed 904
SusWrite 255
177% 792 MB/s
4K Read 41.7
4K Write 95.5
4K Mixed 52.3
181% 63.2 MB/s
DQ Read 658
DQ Write 314
DQ Mixed 540
386% 504 MB/s
59GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 132 132 97 140 122 134 MB/s
104% Outstanding
Read 920
Write 259
Mixed 292
SusWrite 126
87% 400 MB/s
4K Read 34.4
4K Write 78.9
4K Mixed 39.3
144% 50.9 MB/s
DQ Read 577
DQ Write 114
DQ Mixed 204
186% 298 MB/s
35GB free (System drive)
Firmware: 26300039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 114 103 100 100 100 99 MB/s
92.2% Outstanding
Read 847
Write 122
Mixed 192
SusWrite 103
68% 316 MB/s
4K Read 32.3
4K Write 81.2
4K Mixed 34.5
136% 49.3 MB/s
DQ Read 376
DQ Write 98.8
DQ Mixed 128
123% 201 MB/s
10GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 91 71 62 58 52 46 MB/s
88.9% Excellent
Read 848
Write 93.1
Mixed 166
SusWrite 63.3
63% 293 MB/s
4K Read 27.2
4K Write 73.7
4K Mixed 31.7
121% 44.2 MB/s
DQ Read 546
DQ Write 87.6
DQ Mixed 170
162% 268 MB/s
10GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 47 45 46 33 31 39 MB/s
80% Very good
Read 811
Write 60.6
Mixed 113
SusWrite 40
54% 256 MB/s
4K Read 28.9
4K Write 54.1
4K Mixed 26.8
107% 36.6 MB/s
DQ Read 515
DQ Write 53.7
DQ Mixed 110
124% 226 MB/s
12GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 110 91 89 86 82 79 MB/s
77.1% Very good
Read 699
Write 160
Mixed 234
SusWrite 89.5
64% 296 MB/s
4K Read 23.7
4K Write 76.9
4K Mixed 22
105% 40.9 MB/s
DQ Read 448
DQ Write 108
DQ Mixed 143
140% 233 MB/s
50 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 75,788,309 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 PM991a Samsung 128GB Builds (Compare 3,656 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 13%
Tree trunk
Desktop
Desktop 74%
Battleship
Workstation
Workstation 12%
Tree trunk

System: Dell Inspiron 15 3511

CPU
Core i5-1135G7IntelBench 69%, 36,962 samples1,745x
Core i3-1115G4IntelBench 51%, 18,815 samples874x
Core i7-1165G7IntelBench 66%, 51,565 samples543x
GPU
Iris XeIntelBench 14%, 144,774 samples2,151x
UHD GraphicsIntelBench 9%, 39,662 samples909x
UHD G1IntelBench 5%, 68,603 samples459x
SSD
PM991a Samsung 128GBNvmeBench 127%, 50 samples1x
RAM
HMAA1GS6CJR6N-XN 1x8GBUnknownBench 32%, 13,137 samples1,028x
M471A1G44BB0-CWE 1x8GBSamsungBench 34%, 7,899 samples351x
HMAA1GS6CJR6N-XN 2x8GBUnknownBench 65%, 26,875 samples285x
EDIT WITH CUSTOM PC BUILDER

Popular PM991a Samsung 128GB systems:

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute

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.

UserBenchmark of the month

Gaming Desktop ProGaming

How it works

  • - Download and run UserBenchmark
  • - CPU tests include: integer, floating and string
  • - GPU tests include: six 3D game simulations
  • - Drive tests include: read, write, sustained write and mixed IO
  • - RAM tests include: single/multi core bandwidth and latency
  • - SkillBench (space shooter) tests user input accuracy
  • - 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 current market leaders
  • - Explore your best upgrade options with a virtual PC build
  • - Compare your in-game FPS to other users with your hardware
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.

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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 $254Nvidia RTX 4060 $300Crucial MX500 250GB $39
Intel Core i5-12400F $133Nvidia RTX 4060-Ti $385Samsung 850 Evo 120GB $80
Intel Core i5-12600K $163Nvidia 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) $31Corsair Vengeance LPX DDR4 3000 C15 2x8GB $37SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $79G.SKILL Trident Z DDR4 3200 C14 4x16GB $351SanDisk Ultra Fit 32GB $16
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