WD WDS400T2X0E

Black SN850X M.2 4TB

Black SN850X M.2 4TB
BENCHMARKS (8,772)
MKT (0.3%)
BUILDS
(4)
BUY • $265

Effective Speed -4%Effective Speed -4%Average Score -14%Read -9%, Write -21%, 4K Read -28%, 4K Write -8%, Mixed -7%, 4K Mixed -29%, SusWrite 6%Peak Score -46%Read -26%, Write -28%, 4K Read -126%, 4K Write -20%, Mixed -29%, 4K Mixed -94%, SusWrite 2%Value & Sentiment -28%User Rating 6%, Market Share -109%, Price -30%, Value 23%Nice To Haves -1%DQ Read 7%, DQ Write 9%, DQ Mixed 9%, ADQ Read 4%, ADQ Write 10%, ADQ Mixed 4%, Age -47%, AS-SSD Total -2%

Average Bench: 522% (7^th of 1080)

Based on 8,772 user benchmarks. Model: WD_BLACK SN850X 4000GB

The WD Black SN850X has a superb consumer performance profile. As well as offering solid burst speeds of 5 GB/s, the SN850X also offers respectable out of cache performance. At current prices (1TB $90 USD, 2TB $145 USD and 4TB $290 USD) the WD Black SN850X is our top value pick at every capacity. ^{[Jun '24 SSDrivePro]}

Poor: 288%Average: 522% Great: 683%

Popular builds with this SSD

Outstanding average bench

The WD Black SN850X M.2 4TB averaged 422.0% higher than the peak scores attained by the group leaders. This is an excellent result which ranks the WD Black SN850X M.2 4TB near the top of the comparison list.

Strengths

Avg. 4K-64Thread Mixed IO Speed 1,548MB/s

Avg. Sequential Write Speed 3,816MB/s

See where your SSD ranks →

Terrible consistency

The range of scores (95th - 5th percentile) for the WD Black SN850X M.2 4TB is 396%. This is a particularly wide range which indicates that the WD Black SN850X M.2 4TB performs inconsistently under varying real world conditions.

Weaknesses

Avg. 4K Random Write Speed 189MB/s

Avg. 4K Random Read Speed 67.2MB/s

Average Bench

(Based on 8,772 samples)

Rank 7522%

Min	Avg	Max
2,042	Read 3,793	4,696
1,928	Write 3,816	4,940
1,799	Mixed 2,970	3,586
1,614	SusWrite 3,370	4,656
785% 3,487 MB/s

Min	Avg	Max
44	4K Read 67.2	84.7
60	4K Write 189	315
46.1	4K Mixed 83.5	113
309% 113 MB/s

Min	Avg	Max
748	DQ Read 1,787	2,486
199	DQ Write 1,382	2,073
373	DQ Mixed 1,548	2,284
1,168% 1,572 MB/s

User Benchmarks

Bench

Sequential

Random 4k

Deep queue 4k

The fastest SSD (mainstream) averages a speed of 100%

USA-User, 3 hrs ago.

3TB free

Firmware: 624361WD

SusWrite @10s intervals: 4901 5027 5018 5023 4982 2428 MB/s

680% Outstanding

Write 5,118

Mixed 3,670

SusWrite 4,563

1,032% 4,582 MB/s

4K Read 78.6

4K Write 273

4K Mixed 103

396% 151 MB/s

DQ Read 2,002

DQ Write 1,666

DQ Mixed 1,812

1,363% 1,827 MB/s

USA-User, 3 hrs ago.

3.5TB free

Firmware: 624361WD

SusWrite @10s intervals: 4436 4586 4610 4588 4567 4600 MB/s

664% Outstanding

Write 4,654

Mixed 3,474

SusWrite 4,565

960% 4,255 MB/s

4K Read 74.2

4K Write 253

4K Mixed 98.6

373% 142 MB/s

DQ Read 2,417

DQ Write 2023

DQ Mixed 2204

1,655% 2,215 MB/s

USA-User, 1 hr ago.

1.5TB free (System drive)

Firmware: 624361WD

SusWrite @10s intervals: 5015 5029 3863 1550 2017 1469 MB/s

568% Outstanding

Write 5,120

Mixed 3531

SusWrite 3157

927% 4,120 MB/s

4K Read 70.5

4K Write 254

4K Mixed 93.9

362% 140 MB/s

DQ Read 1,885

DQ Write 1,621

DQ Mixed 1,754

1,314% 1,754 MB/s

USA-User, 3 hrs ago.

2.5TB free

Firmware: 624331WD

SusWrite @10s intervals: 3576 3586 3591 3577 3563 3581 MB/s

524% Outstanding

Write 3,788

Mixed 3,003

SusWrite 3,579

797% 3,536 MB/s

4K Read 57.8

4K Write 126

4K Mixed 68.7

242% 84.1 MB/s

DQ Read 2,044

DQ Write 1,588

DQ Mixed 1,752

1,328% 1,795 MB/s

CAN-User, 2 hrs ago.

1.5TB free (System drive)

Firmware: 624331WD

SusWrite @10s intervals: 3786 3794 3728 2056 1994 1985 MB/s

496% Outstanding

Write 3,879

Mixed 3,097

SusWrite 2,890

785% 3,493 MB/s

4K Read 59.1

4K Write 141

4K Mixed 74.5

260% 91.7 MB/s

DQ Read 1,879

DQ Write 1,528

DQ Mixed 1,744

1,294% 1,717 MB/s

USA-User, 6 hrs ago.

3.5TB free (System drive)

Firmware: 624361WD

SusWrite @10s intervals: 2501 2498 2528 2532 2539 2531 MB/s

416% Outstanding

Write 2563

Mixed 2,353

SusWrite 2,522

570% 2,531 MB/s

4K Read 72.4

4K Write 173

4K Mixed 88.7

315% 112 MB/s

DQ Read 1,405

DQ Write 1,172

DQ Mixed 1,287

964% 1,288 MB/s

USA-User, 1 hr ago.

2.5TB free

Firmware: 624361WD

SusWrite @10s intervals: 1012 1260 1257 1341 1356 1311 MB/s

257% Outstanding

Write 1,382

Mixed 1,338

SusWrite 1256

306% 1,357 MB/s

4K Read 53.8

4K Write 93

4K Mixed 61.9

210% 69.6 MB/s

DQ Read 1,353

DQ Write 1,247

DQ Mixed 1,285

968% 1,295 MB/s

8,772 MORE »

Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 76,509,615 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 Black SN850X M.2 4TB Builds (Compare 4,318 builds) See popular component choices, score breakdowns and rankings

Gaming 453%

UFO

Desktop 125%

UFO

Workstation 596%

UFO

Motherboard: Asus ROG STRIX Z790-E GAMING WIFI

CPU
Core i9-13900KIntel $440Bench 129%, 49,132 samples	2,126x
Core i7-13700KIntel $280Bench 126%, 41,056 samples	708x
Core i9-14900KIntel $510Bench 131%, 12,283 samples	311x

GPU
RTX 4090Nvidia $1,739Bench 370%, 25,956 samples	1,492x
RTX 4080Nvidia $960Bench 290%, 22,998 samples	502x
RTX 4070-TiNvidia $732Bench 240%, 46,082 samples	379x

SSD
Black SN850X M.2 4TBWD $265Bench 522%, 8,772 samples	1x

RAM
TZ/RJ/FX DDR5 6400 C36 2x16GBG.SKILL $105Bench 173%, 39,467 samples	247x
TZ/RJ/FX DDR5 6400 C32 2x16GBG.SKILL $110Bench 187%, 18,403 samples	209x
TZ/RJ/FX DDR5 6400 C32 2x32GBG.SKILL $200Bench 188%, 6,571 samples	194x

EDIT WITH CUSTOM PC BUILDER

Value: 92% - Outstanding

Total price: $2,549

Popular Black SN850X M.2 4TB compatible motherboards:

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

CPU

GPU

SSD

HDD

RAM

USB

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) July 2024 SSD Rankings

Welcome to our 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]

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.

Comments

SSDrivePro

level
1,921

The Ultimate X Factor...

Added 1 month ago.

USA-User

level
9,918

Excellent (edit your comment) Add link

1 month ago.

TUR-User

level
5,548

Good

7 months ago.

but Samsung 990 pro 4tb is more better

SSDrivePro

level
1,921

Good

1 month ago.

arrxw

level
44

Excellent

15 months ago.

If you install this in a ps5 it will outrun the series x.

Your
opinion?

▲Like ▼Dislike

Over the hill
Age: 24 months

Speed Comparisons

vs WD Black SN850X M.2 2TB
vs WD Black SN850X M.2 1TB
vs Crucial T700 M.2 4TB
vs WD Black SN850X M.2 4TB
vs Samsung 990 Pro M.2 2TB
vs Samsung 990 Pro M.2 4TB
vs Samsung 990 Pro M.2 1TB
vs Crucial T705 M.2 2TB
vs Crucial T705 M.2 1TB

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?

How is the AS SSD total score calculated?

ALL FAQs »

CPU	GPU	SSD
Intel Core i5-12600K $175	Nvidia RTX 4060 $293	WD Black SN850X M.2 2TB $145
Intel Core i5-12400F $110	Nvidia RTX 4060-Ti $389	WD Black SN850X M.2 1TB $80
Intel Core i5-13600K $235	Nvidia RTX 4070 $499	Crucial T700 M.2 4TB $342

WD WDS400T2X0E

Black SN850X M.2 4TB

Average Bench: 522% (7^th of 1080)

Popular builds with this SSD

Outstanding average bench

Strengths

Terrible consistency

Weaknesses

Average Bench

Market Share (See Leaders)

Prices

CHOOSE A COMPONENT:

Motherboard: Asus ROG STRIX Z790-E GAMING WIFI

Popular Black SN850X M.2 4TB compatible motherboards:

UserBenchmark of the month

How it works

Group Test Results

Comments

Official site www.westerndigital.com/...

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Speed Comparisons

Frequently Asked Questions

Best User Rated

		$2659 mins
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WD WDS400T2X0E

Black SN850X M.2 4TB

Average Bench: 522% (7th of 1080)

Popular builds with this SSD

Outstanding average bench

Strengths

Terrible consistency

Weaknesses

Average Bench

Market Share (See Leaders)

Prices

CHOOSE A COMPONENT:

Motherboard: Asus ROG STRIX Z790-E GAMING WIFI

Popular Black SN850X M.2 4TB compatible motherboards:

UserBenchmark of the month

How it works

Group Test Results

Share a related link

Comments

Official site www.westerndigital.com/...

Excellent (edit your comment) Add link

Good

Good

Excellent

Speed Comparisons

Frequently Asked Questions

Best User Rated

Feedback

Average Bench: 522% (7^th of 1080)