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Nvme

PM991 Samsung 512GB

▲ 500 ▼

Release date ≈ Q4 2020.

Average Bench: 125% (193rd of 1080)

Based on 255 user benchmarks.  Model: NVMe PM991 NVMe Samsung 512GB
Poor: 77%Average: 125% Great: 180%

Popular builds with this SSD

Outstanding average bench

The Nvme PM991 Samsung 512GB averaged 25.0% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Nvme PM991 Samsung 512GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 407MB/s
Avg. 4K-64Thread Read Speed 591MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Nvme PM991 Samsung 512GB is 103%. This is a particularly wide range which indicates that the Nvme PM991 Samsung 512GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 329MB/s
Avg. 4K-64Thread Write Speed 254MB/s

Average Bench

(Based on 255 samples)
Rank 193125%
Min Avg Max
662 Read 991 1,294
110 Write 574 1,087
176 Mixed 581 1,046
95.9 SusWrite 329 587
137% 619 MB/s
Min Avg Max
18.5 4K Read 33.9 48.8
45.8 4K Write 83.4 127
25.4 4K Mixed 42.8 65.3
150% 53.4 MB/s
Min Avg Max
282 DQ Read 591 904
86.6 DQ Write 254 491
141 DQ Mixed 407 745
306% 417 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
286GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 761 721 355 291 254 226 MB/s
150% Outstanding
Read 1,201
Write 1,045
Mixed 1,001
SusWrite 435
206% 920 MB/s
4K Read 41.8
4K Write 103
4K Mixed 55.7
189% 66.8 MB/s
DQ Read 464
DQ Write 275
DQ Mixed 314
249% 351 MB/s
358GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 254 201 174 148 175 186 MB/s
104% Outstanding
Read 834
Write 472
Mixed 437
SusWrite 190
107% 483 MB/s
4K Read 39.4
4K Write 82.8
4K Mixed 40.9
156% 54.4 MB/s
DQ Read 386
DQ Write 121
DQ Mixed 180
152% 229 MB/s
74GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 97 84 76 69 68 65 MB/s
99.9% Outstanding
Read 1,082
Write 82.3
Mixed 178
SusWrite 76.4
76% 354 MB/s
4K Read 31.7
4K Write 63.4
4K Mixed 36.6
128% 43.9 MB/s
DQ Read 461
DQ Write 85.7
DQ Mixed 154
144% 233 MB/s
151GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 160 156 151 148 181 173 MB/s
99.7% Outstanding
Read 908
Write 183
Mixed 201
SusWrite 161
79% 363 MB/s
4K Read 33.2
4K Write 77
4K Mixed 39.5
142% 49.9 MB/s
DQ Read 322
DQ Write 115
DQ Mixed 318
209% 252 MB/s
96GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 150 126 120 113 121 112 MB/s
95.5% Outstanding
Read 911
Write 132
Mixed 162
SusWrite 124
71% 332 MB/s
4K Read 31.8
4K Write 83.4
4K Mixed 32.7
134% 49.3 MB/s
DQ Read 368
DQ Write 119
DQ Mixed 170
145% 219 MB/s
221GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 133 119 119 93 85 87 MB/s
72.3% Very good
Read 580
Write 230
Mixed 281
SusWrite 106
66% 299 MB/s
4K Read 21.6
4K Write 58.4
4K Mixed 27.9
99% 36 MB/s
DQ Read 424
DQ Write 113
DQ Mixed 237
183% 258 MB/s
224GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 133 114 123 111 105 100 MB/s
67.4% Good
Read 758
Write 144
Mixed 150
SusWrite 114
63% 292 MB/s
4K Read 16.8
4K Write 47.8
4K Mixed 19.2
75% 27.9 MB/s
DQ Read 242
DQ Write 75.2
DQ Mixed 100
89% 139 MB/s
255 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 77,544,812 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 PM991 Samsung 512GB Builds (Compare 937 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 14%
Tree trunk
Desktop
Desktop 73%
Battleship
Workstation
Workstation 12%
Tree trunk

System: Dell Inspiron 5406 2n1

CPU
Core i7-1165G7IntelBench 66%, 51,565 samples428x
Core i5-1135G7IntelBench 68%, 82,426 samples413x
Core i3-1115G4IntelBench 51%, 18,815 samples95x
GPU
Iris XeIntelBench 14%, 144,774 samples803x
UHD GraphicsIntelBench 9%, 39,662 samples95x
GeForce MX330NvidiaBench 14%, 4,518 samples39x
SSD
PM991 Samsung 512GBNvmeBench 125%, 255 samples1x
RAM
M471A1K43DB1-CWE 1x8GBSamsungBench 45%, 34,565 samples84x
HMAA1GS6CJR6N-XN 1x8GBUnknownBench 32%, 13,137 samples76x
KKRVFX-MIE 1x8GBUnknownBench 38%, 1,686 samples52x
EDIT WITH CUSTOM PC BUILDER

Popular PM991 Samsung 512GB systems:

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Speed Comparisons

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1080 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?
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The Best
CPUGPUSSD
Intel Core i5-13600K $210Nvidia RTX 4060 $280WD Black SN850X M.2 2TB $135
Intel Core i5-12600K $159Nvidia RTX 4060-Ti $389WD Black SN850X M.2 1TB $84
Intel Core i5-12400F $111Nvidia RTX 4070 $500Crucial T700 M.2 4TB $370
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