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Pm991a

NVMe Samsung 1024GB

▲ 500 ▼

Release date ≈ Q1 2021.

Average Bench: 216% (95th of 1080)

Based on 421 user benchmarks.  Model: PM991a NVMe Samsung 1024GB
Poor: 106%Average: 216% Great: 295%

Popular builds with this SSD

Outstanding average bench

The Pm991a NVMe Samsung 1024GB averaged 115.8% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Pm991a NVMe Samsung 1024GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 819MB/s
Avg. 4K-64Thread Read Speed 1,073MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Pm991a NVMe Samsung 1024GB is 189%. This is a particularly wide range which indicates that the Pm991a NVMe Samsung 1024GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K Random Write Speed 116MB/s
Avg. 4K Random Read Speed 46.3MB/s

Average Bench

(Based on 421 samples)
Rank 95216%
Min Avg Max
752 Read 1,314 1,660
229 Write 1,293 1,918
201 Mixed 1,116 1,641
142 SusWrite 994 1,387
265% 1,179 MB/s
Min Avg Max
24 4K Read 46.3 57.2
49.9 4K Write 116 168
30.7 4K Mixed 60.2 83.2
209% 74.3 MB/s
Min Avg Max
548 DQ Read 1,073 1,489
137 DQ Write 655 1,217
194 DQ Mixed 819 1,217
622% 849 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
898GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 1225 1013 966 925 923 917 MB/s
200% Outstanding
Read 1,374
Write 1,473
Mixed 1,267
SusWrite 995
288% 1,277 MB/s
4K Read 43.8
4K Write 101
4K Mixed 58.8
195% 67.8 MB/s
DQ Read 766
DQ Write 293
DQ Mixed 582
417% 547 MB/s
835GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 1279 1298 582 315 412 296 MB/s
186% Outstanding
Read 1,296
Write 1,482
Mixed 1,228
SusWrite 697
265% 1,176 MB/s
4K Read 48.1
4K Write 126
4K Mixed 66.1
224% 80.2 MB/s
DQ Read 676
DQ Write 283
DQ Mixed 366
301% 441 MB/s
412GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 114 221 197 146 152 183 MB/s
150% Outstanding
Read 1,149
Write 748
Mixed 412
SusWrite 169
137% 619 MB/s
4K Read 38.3
4K Write 141
4K Mixed 51.2
198% 76.7 MB/s
DQ Read 1,178
DQ Write 330
DQ Mixed 307
342% 605 MB/s
220GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 159 130 133 136 137 137 MB/s
135% Outstanding
Read 1,158
Write 206
Mixed 384
SusWrite 138
102% 472 MB/s
4K Read 36.2
4K Write 100
4K Mixed 46.3
167% 60.9 MB/s
DQ Read 1,149
DQ Write 122
DQ Mixed 233
272% 502 MB/s
294GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 303 269 297 183 174 268 MB/s
123% Outstanding
Read 1,089
Write 966
Mixed 330
SusWrite 249
146% 659 MB/s
4K Read 30.2
4K Write 92.6
4K Mixed 44.8
152% 55.9 MB/s
DQ Read 598
DQ Write 175
DQ Mixed 428
304% 400 MB/s
153GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 147 149 157 132 146 129 MB/s
110% Outstanding
Read 1,104
Write 608
Mixed 260
SusWrite 144
116% 529 MB/s
4K Read 25.4
4K Write 62.9
4K Mixed 32.1
113% 40.1 MB/s
DQ Read 816
DQ Write 185
DQ Mixed 355
298% 452 MB/s
149GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 140 101 117 104 110 119 MB/s
93.9% Outstanding
Read 734
Write 234
Mixed 209
SusWrite 115
70% 323 MB/s
4K Read 27.4
4K Write 65
4K Mixed 34.8
120% 42.4 MB/s
DQ Read 790
DQ Write 117
DQ Mixed 225
223% 378 MB/s
85GB free (System drive)
Firmware: 26304039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 133 68 45 42 42 43 MB/s
40.3% Average
Read 455
Write 328
Mixed 248
SusWrite 62.2
61% 273 MB/s
4K Read 10.1
4K Write 12.9
4K Mixed 10.1
35% 11 MB/s
DQ Read 224
DQ Write 114
DQ Mixed 337
206% 225 MB/s
421 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 77,604,578 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 1024GB Builds (Compare 2,929 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 14%
Tree trunk
Desktop
Desktop 84%
Aircraft carrier
Workstation
Workstation 14%
Tree trunk

System: Dell G15 5511

CPU
Core i7-11800HIntelBench 88%, 79,827 samples1,924x
Core i5-11400HIntelBench 80%, 35,470 samples533x
Gen Intel Core i5-11260H11thBench 72%, 2,929 samples468x
GPU
UHD GraphicsIntelBench 7%, 53,008 samples976x
RTX 3060 (Laptop)NvidiaBench 90%, 102,706 samples629x
UHD GraphicsIntelBench 4%, 25,082 samples537x
SSD
NVMe Samsung 1024GBPm991aBench 216%, 421 samples1x
RAM
HMAA1GS6CJR6N-XN 2x8GBUnknownBench 65%, 26,875 samples816x
M471A1G44BB0-CWE 2x8GBSamsungBench 64%, 6,868 samples334x
4ATF1G64HZ-3G2E2 2x8GBUnknownBench 71%, 3,640 samples303x
EDIT WITH CUSTOM PC BUILDER

Popular NVMe Samsung 1024GB systems:

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Speed Comparisons

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 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?
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What is sequential read speed?
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What is 4K 64 thread write speed?
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The Best
CPUGPUSSD
Intel Core i5-13600K $210Nvidia RTX 4060 $285WD Black SN850X M.2 2TB $125
Intel Core i5-12600K $160Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $80
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $330
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