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Pm991

NVMe Samsung 512GB

▲ 500 ▼

Release date ≈ Q4 2019.

Average Bench: 115% (199th of 1072)

Based on 2,686 user benchmarks.  Model: PM991 NVMe Samsung 512GB
Poor: 70%Average: 115% Great: 198%

Popular builds with this SSD

Outstanding average bench

The Pm991 NVMe Samsung 512GB averaged 15.3% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Pm991 NVMe Samsung 512GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 325MB/s
Avg. 4K-64Thread Read Speed 536MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Pm991 NVMe Samsung 512GB is 128%. This is a particularly wide range which indicates that the Pm991 NVMe Samsung 512GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 252MB/s
Avg. Sequential Write Speed 412MB/s
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Average Bench

(Based on 2,686 samples)
Rank 199115%
Min Avg Max
553 Read 931 1,369
81.6 Write 412 1,227
148 Mixed 429 1,182
69.4 SusWrite 252 628
112% 506 MB/s
Min Avg Max
16.3 4K Read 34.2 49.5
38.3 4K Write 81.2 137
19.5 4K Mixed 40 69.7
146% 51.8 MB/s
Min Avg Max
287 DQ Read 536 902
72.8 DQ Write 274 875
104 DQ Mixed 325 733
263% 378 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
411GB free (System drive)
Firmware: 25304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 1012 1008 503 326 330 329 MB/s
157% Outstanding
Read 1,170
Write 990
Mixed 939
SusWrite 584
206% 921 MB/s
4K Read 34.6
4K Write 85.6
4K Mixed 45.2
156% 55.1 MB/s
DQ Read 688
DQ Write 488
DQ Mixed 558
425% 578 MB/s
189GB free (System drive)
Firmware: 25306039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 124 112 107 114 110 107 MB/s
105% Outstanding
Read 1,112
Write 171
Mixed 148
SusWrite 112
83% 386 MB/s
4K Read 30.5
4K Write 82.4
4K Mixed 35.3
135% 49.4 MB/s
DQ Read 461
DQ Write 111
DQ Mixed 142
142% 238 MB/s
324GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 524 254 214 208 201 197 MB/s
102% Outstanding
Read 998
Write 803
Mixed 806
SusWrite 266
160% 718 MB/s
4K Read 24.3
4K Write 40.4
4K Mixed 31.9
99% 32.2 MB/s
DQ Read 400
DQ Write 246
DQ Mixed 344
251% 330 MB/s
365GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 187 173 175 164 180 163 MB/s
100% Outstanding
Read 912
Write 192
Mixed 246
SusWrite 174
83% 381 MB/s
4K Read 28.2
4K Write 82.6
4K Mixed 35.7
132% 48.8 MB/s
DQ Read 468
DQ Write 95.7
DQ Mixed 188
162% 251 MB/s
98GB free (System drive)
Firmware: 25304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 143 132 105 102 111 96 MB/s
97.1% Outstanding
Read 903
Write 170
Mixed 163
SusWrite 115
73% 338 MB/s
4K Read 29.2
4K Write 81.5
4K Mixed 37
135% 49.2 MB/s
DQ Read 469
DQ Write 91.7
DQ Mixed 207
171% 256 MB/s
79GB free (System drive)
Firmware: 25306039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 104 101 99 107 98 82 MB/s
95.7% Outstanding
Read 1,056
Write 143
Mixed 206
SusWrite 98.7
81% 376 MB/s
4K Read 27.3
4K Write 58
4K Mixed 29.4
110% 38.2 MB/s
DQ Read 468
DQ Write 151
DQ Mixed 142
148% 254 MB/s
86GB free (System drive)
Firmware: 25306039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 65 49 41 64 46 48 MB/s
70.2% Very good
Read 813
Write 75.3
Mixed 160
SusWrite 52.1
59% 275 MB/s
4K Read 20.8
4K Write 42.7
4K Mixed 25
86% 29.5 MB/s
DQ Read 284
DQ Write 63
DQ Mixed 101
93% 149 MB/s
2,686 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 75,727,000 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 512GB Builds (Compare 1,386 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 9%
Tree trunk
Desktop
Desktop 58%
Gunboat
Workstation
Workstation 8%
Tree trunk

System: Dell Inspiron 5593

CPU
Core i7-1065G7IntelBench 53%, 58,314 samples747x
Core i5-1035G1IntelBench 51%, 53,170 samples607x
Core i3-1005G1IntelBench 44%, 22,960 samples32x
GPU
Iris Plus G7IntelBench 9%, 52,498 samples577x
UHD G1IntelBench 5%, 68,603 samples533x
GeForce MX230NvidiaBench 10%, 6,801 samples271x
SSD
NVMe Samsung 512GBPm991Bench 115%, 2,686 samples1x
RAM
HMA81GS6JJR8N-VK 1x8GBHynixBench 40%, 48,644 samples127x
HMA81GS6DJR8N-VK 1x8GBHynixBench 41%, 9,451 samples122x
M471A1K43CB1-CTD 1x8GBSamsungBench 40%, 96,646 samples95x
EDIT WITH CUSTOM PC BUILDER

Popular NVMe Samsung 512GB 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.

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  • - CPU tests include: integer, floating and string
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  • - Drive tests include: read, write, sustained write and mixed IO
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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 $184Nvidia RTX 4070 $539Samsung 860 Evo 250GB $52
HDDRAMUSB
Seagate Barracuda 1TB (2016) $39Corsair Vengeance LPX DDR4 3200 C16 2x8GB $45SanDisk 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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