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Nvme

PM991a Samsung 512GB

▲ 500 ▼

Release date ≈ Q1 2021.

Average Bench: 132% (175th of 1072)

Based on 1,958 user benchmarks.  Model: NVMe PM991a NVMe Samsung 512GB
Poor: 71%Average: 132% Great: 237%

Popular builds with this SSD

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)
Rank 175132%
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%
313GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 1045 1037 920 693 160 181 MB/s
223% Outstanding
Read 1,660
Write 1655
Mixed 1,383
SusWrite 673
301% 1,342 MB/s
4K Read 39.8
4K Write 136
4K Mixed 68
220% 81.4 MB/s
DQ Read 1,182
DQ Write 924
DQ Mixed 922
725% 1,009 MB/s
325GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 141 158 149 168 176 181 MB/s
140% Outstanding
Read 1215
Write 242
Mixed 224
SusWrite 162
99% 461 MB/s
4K Read 37.6
4K Write 148
4K Mixed 48.6
197% 77.9 MB/s
DQ Read 850
DQ Write 138
DQ Mixed 318
278% 435 MB/s
285GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 597 569 481 209 159 102 MB/s
136% Outstanding
Read 1,072
Write 1,058
Mixed 1,187
SusWrite 353
206% 918 MB/s
4K Read 41
4K Write 96.3
4K Mixed 56.7
186% 64.7 MB/s
DQ Read 405
DQ Write 188
DQ Mixed 281
212% 291 MB/s
309GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 165 180 199 173 157 175 MB/s
118% Outstanding
Read 1,084
Write 183
Mixed 349
SusWrite 175
97% 447 MB/s
4K Read 32.7
4K Write 87.8
4K Mixed 39.9
147% 53.5 MB/s
DQ Read 654
DQ Write 195
DQ Mixed 200
206% 350 MB/s
112GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 169 215 173 132 147 147 MB/s
111% Outstanding
Read 1,046
Write 232
Mixed 351
SusWrite 164
98% 448 MB/s
4K Read 29.6
4K Write 81.4
4K Mixed 38.4
137% 49.8 MB/s
DQ Read 617
DQ Write 160
DQ Mixed 207
199% 328 MB/s
92GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 126 130 119 118 116 115 MB/s
99% Outstanding
Read 913
Write 159
Mixed 233
SusWrite 121
77% 356 MB/s
4K Read 28
4K Write 65.9
4K Mixed 34.4
121% 42.8 MB/s
DQ Read 626
DQ Write 167
DQ Mixed 245
220% 346 MB/s
260GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 166 159 145 118 141 156 MB/s
91.5% Outstanding
Read 773
Write 62
Mixed 235
SusWrite 147
66% 304 MB/s
4K Read 22.8
4K Write 43.5
4K Mixed 31.6
98% 32.6 MB/s
DQ Read 783
DQ Write 153
DQ Mixed 310
268% 415 MB/s
313GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 180 178 172 143 136 117 MB/s
87.8% Excellent
Read 921
Write 309
Mixed 166
SusWrite 154
84% 388 MB/s
4K Read 28.7
4K Write 52.3
4K Mixed 30.8
111% 37.3 MB/s
DQ Read 247
DQ Write 85.9
DQ Mixed 148
114% 160 MB/s
98GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 161 154 138 156 147 149 MB/s
59.4% Above average
Read 590
Write 180
Mixed 286
SusWrite 151
66% 302 MB/s
4K Read 18.7
4K Write 20.3
4K Mixed 11.1
53% 16.7 MB/s
DQ Read 335
DQ Write 154
DQ Mixed 179
150% 223 MB/s
1,958 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 75,712,461 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 512GB Builds (Compare 10,173 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

CPU
Core i7-11700Intel  $217Bench 98%, 20,430 samples4,451x
Core i7-10700Intel  $233Bench 93%, 71,010 samples1,829x
Core i5-11400Intel  $134Bench 94%, 24,459 samples1,153x
GPU
RTX 3060-TiNvidia  $340Bench 128%, 442,467 samples2,417x
UHD Graphics 750IntelBench 7%, 15,464 samples1,090x
RTX 3060Nvidia  $279Bench 100%, 447,556 samples991x
SSD
PM991a Samsung 512GBNvmeBench 132%, 1,958 samples1x
RAM
HMAA1GU6CJR6N-XN 2x8GBUnknownBench 65%, 1,864 samples653x
M378A2G43AB3-CWE 2x16GBUnknownBench 79%, 764 samples539x
M378A1G44AB0-CWE 2x8GBUnknownBench 63%, 886 samples396x
EDIT WITH CUSTOM PC BUILDER Value: 96% - Outstanding Total price: $557

Popular PM991a 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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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
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  • - Compare your components to the current market leaders
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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 $300Crucial MX500 250GB $40
Intel Core i5-12400F $133Nvidia RTX 4060-Ti $385Samsung 850 Evo 120GB $80
Intel Core i5-12600K $177Nvidia 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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