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Nvme

PM991 Samsung 256GB

▲ 500 ▼

Release date ≈ Q4 2020.

Average Bench: 108% (224th of 1072)

Based on 343 user benchmarks.  Model: NVMe PM991 NVMe Samsung 256GB
Poor: 67%Average: 108% Great: 165%

Popular builds with this SSD

Outstanding average bench

The Nvme PM991 Samsung 256GB averaged 7.7% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the Nvme PM991 Samsung 256GB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 302MB/s
Avg. Sequential Read Speed 953MB/s

Terrible consistency

The range of scores (95th - 5th percentile) for the Nvme PM991 Samsung 256GB is 98.8%. This is a particularly wide range which indicates that the Nvme PM991 Samsung 256GB performs inconsistently under varying real world conditions.

Weaknesses

Avg. Sustained Write Speed 188MB/s
Avg. Sequential Write Speed 433MB/s
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Average Bench

(Based on 343 samples)
Rank 224108%
Min Avg Max
644 Read 953 1,303
78.5 Write 433 914
130 Mixed 457 928
76.5 SusWrite 188 330
112% 508 MB/s
Min Avg Max
17.6 4K Read 33.6 50.3
44.4 4K Write 88.1 135
19.7 4K Mixed 39.3 68.5
148% 53.7 MB/s
Min Avg Max
217 DQ Read 334 481
77.2 DQ Write 237 742
105 DQ Mixed 302 556
221% 291 MB/s
User Benchmarks BenchSequentialRandom 4kDeep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
64GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 19 19 17 18 22 23 MB/s
361% Outstanding
Read 3,867
Write 30.4
Mixed 59.9
SusWrite 19.7
207% 994 MB/s
4K Read 509
4K Write 1.5
4K Mixed 4.3
778% 172 MB/s
192GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 895 627 157 169 172 177 MB/s
158% Outstanding
Read 1,307
Write 890
Mixed 957
SusWrite 366
196% 880 MB/s
4K Read 42.4
4K Write 101
4K Mixed 57.1
191% 67 MB/s
DQ Read 480
DQ Write 612
DQ Mixed 552
415% 548 MB/s
93GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 121 127 87 114 117 117 MB/s
84.6% Excellent
Read 869
Write 133
Mixed 181
SusWrite 114
70% 324 MB/s
4K Read 22.6
4K Write 93.2
4K Mixed 24.8
115% 46.9 MB/s
DQ Read 242
DQ Write 133
DQ Mixed 161
127% 179 MB/s
91GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 105 111 102 108 97 90 MB/s
84.1% Excellent
Read 939
Write 165
Mixed 203
SusWrite 102
76% 352 MB/s
4K Read 30.9
4K Write 50.7
4K Mixed 29.2
111% 36.9 MB/s
DQ Read 190
DQ Write 91.8
DQ Mixed 135
102% 139 MB/s
35GB free (System drive)
Firmware: 25307039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 124 87 77 80 79 69 MB/s
82.7% Excellent
Read 872
Write 209
Mixed 230
SusWrite 86
76% 349 MB/s
4K Read 27.8
4K Write 69.4
4K Mixed 28.8
116% 42 MB/s
DQ Read 193
DQ Write 135
DQ Mixed 152
117% 160 MB/s
33GB free (System drive)
Firmware: 25311039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 76 77 72 72 68 65 MB/s
55.6% Above average
Read 711
Write 80.2
Mixed 119
SusWrite 71.5
53% 246 MB/s
4K Read 17.3
4K Write 28.7
4K Mixed 11.3
56% 19.1 MB/s
DQ Read 188
DQ Write 93.9
DQ Mixed 120
95% 134 MB/s
86GB free (System drive)
Firmware: 25306039 Max speed: PCIe 16,000 MB/s
SusWrite @10s intervals: 107 105 116 105 111 133 MB/s
47.9% Average
Read 539
Write 111
Mixed 139
SusWrite 113
49% 225 MB/s
4K Read 12.9
4K Write 13.2
4K Mixed 10.3
40% 12.1 MB/s
DQ Read 247
DQ Write 84.2
DQ Mixed 145
113% 159 MB/s
343 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 75,818,076 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 256GB Builds (Compare 3,832 builds) See popular component choices, score breakdowns and rankings
Gaming
Gaming 13%
Tree trunk
Desktop
Desktop 74%
Battleship
Workstation
Workstation 11%
Tree trunk

System: Dell Inspiron 3501

CPU
Core i5-1135G7IntelBench 69%, 36,962 samples1,545x
Core i3-1115G4IntelBench 51%, 18,815 samples745x
Core i3-1005G1IntelBench 44%, 22,960 samples607x
GPU
Iris XeIntelBench 14%, 144,774 samples1,811x
UHD G1IntelBench 5%, 68,603 samples977x
UHD GraphicsIntelBench 9%, 39,662 samples814x
SSD
PM991 Samsung 256GBNvmeBench 108%, 343 samples1x
RAM
HMAA1GS6CJR6N-XN 1x8GBUnknownBench 32%, 13,137 samples334x
M471A1G44AB0-CWE 1x8GBSamsungBench 39%, 19,438 samples266x
HMA851S6DJR6N-XN 1x4GBUnknownBench 35%, 612 samples151x
EDIT WITH CUSTOM PC BUILDER

Popular PM991 Samsung 256GB 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

vs Crucial MX500 250GB
vs Samsung 850 Evo 120GB
vs Samsung 860 Evo 250GB
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vs Samsung 850 Pro 512GB
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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 $290Crucial 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 $48SanDisk Extreme 32GB $28
Seagate Barracuda 2TB (2016) $51G.SKILL Trident Z DDR4 3200 C14 4x16GB $351SanDisk Ultra Fit 32GB $16
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