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WD WDS400T2X0E

Black SN850X M.2 4TB

Black SN850X M.2 4TB
BENCHMARKS (8,772)
MKT (0.2%)
BUILDS
(4)
BUY • $281

Effective Speed -4%Effective Speed -4%Average Score -16%Read -11%, Write -22%, 4K Read -33%, 4K Write -10%, Mixed -9%, 4K Mixed -32%, SusWrite 7%Peak Score -47%Read -26%, Write -30%, 4K Read -127%, 4K Write -20%, Mixed -30%, 4K Mixed -94%, SusWrite 2%Value & Sentiment -33%User Rating 5%, Market Share -117%, Price -38%, Value 17%Nice To Haves -0%DQ Read 7%, DQ Write 9%, DQ Mixed 9%, ADQ Read 4%, ADQ Write 10%, ADQ Mixed 4%, Age -43%, AS-SSD Total -3%

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, 9 hrs ago.

3TB free

Firmware: 624361WD

SusWrite @10s intervals: 4814 4818 4822 4795 4755 4751 MB/s

696% Outstanding

Write 4,667

Mixed 3508

SusWrite 4,792

981% 4,347 MB/s

4K Read 76

4K Write 282

4K Mixed 102

394% 153 MB/s

DQ Read 2592

DQ Write 2,196

DQ Mixed 2431

1,811% 2,406 MB/s

USA-User, 9 hrs ago.

3TB free (System drive)

Firmware: 624361WD

SusWrite @10s intervals: 4747 4882 4836 4870 4890 4902 MB/s

671% Outstanding

Write 4,594

Mixed 3,240

SusWrite 4,854

960% 4,251 MB/s

4K Read 75

4K Write 246

4K Mixed 105

378% 142 MB/s

DQ Read 2,135

DQ Write 1,726

DQ Mixed 1,868

1,416% 1,910 MB/s

USA-User, 7 hrs ago.

3.5TB free (System drive)

Firmware: 624361WD

SusWrite @10s intervals: 4436 4572 4519 4692 4705 4686 MB/s

635% Outstanding

Write 4,809

Mixed 3,497

SusWrite 4,602

981% 4,349 MB/s

4K Read 77.7

4K Write 272

4K Mixed 109

401% 153 MB/s

DQ Read 1,289

DQ Write 1,031

DQ Mixed 1,173

874% 1,164 MB/s

NLD-User, 4 hrs ago.

3.5TB free

Firmware: 624361WD

SusWrite @10s intervals: 3433 4433 4423 4391 4289 4266 MB/s

616% Outstanding

Write 4,242

Mixed 3,222

SusWrite 4,206

882% 3,907 MB/s

4K Read 69.5

4K Write 249

4K Mixed 97.1

362% 139 MB/s

DQ Read 2,167

DQ Write 1887

DQ Mixed 2,064

1,537% 2,039 MB/s

GBR-User, 1 hr ago.

1.5TB free (System drive)

Firmware: 624361WD

SusWrite @10s intervals: 4163 4404 4139 1567 1730 1714 MB/s

559% Outstanding

Write 4,511

Mixed 3,405

SusWrite 2,953

857% 3,810 MB/s

4K Read 74.4

4K Write 285

4K Mixed 104

396% 154 MB/s

DQ Read 2,042

DQ Write 1,693

DQ Mixed 1,867

1,398% 1,867 MB/s

DEU-User, 4 hrs ago.

2TB free

Firmware: 624331WD

SusWrite @10s intervals: 3751 3752 3733 3728 3628 2315 MB/s

485% Outstanding

Write 3,801

Mixed 3054

SusWrite 3,484

803% 3,565 MB/s

4K Read 55.8

4K Write 84.5

4K Mixed 59.8

206% 66.7 MB/s

DQ Read 1295

DQ Write 1,025

DQ Mixed 1,233

903% 1,184 MB/s

CAN-User, 8 hrs ago.

733GB free (System drive)

Firmware: 624331WD

SusWrite @10s intervals: 3310 1975 989 973 1067 1161 MB/s

388% Outstanding

Write 3,602

Mixed 3,173

SusWrite 1,579

720% 3,223 MB/s

4K Read 70.6

4K Write 81.1

4K Mixed 66.9

236% 72.9 MB/s

DQ Read 1,472

DQ Write 198

DQ Mixed 373

390% 681 MB/s

8,772 MORE »

Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 77,170,420 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 4,593 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 $416Bench 129%, 49,132 samples	2,217x
Core i7-13700KIntel $270Bench 126%, 41,056 samples	741x
Core i9-14900KIntel $445Bench 131%, 12,283 samples	364x

GPU
RTX 4090Nvidia $1,802Bench 370%, 37,290 samples	1,576x
RTX 4080Nvidia $991Bench 290%, 22,998 samples	532x
RTX 4070-TiNvidia $727Bench 240%, 46,082 samples	400x

SSD
Black SN850X M.2 4TBWD $281Bench 522%, 8,772 samples	1x

RAM
TZ/RJ/FX DDR5 6400 C36 2x16GBG.SKILL $83Bench 173%, 39,467 samples	257x
TZ/RJ/FX DDR5 6400 C32 2x16GBG.SKILL $110Bench 187%, 18,403 samples	215x
TZ/RJ/FX DDR5 6400 C32 2x32GBG.SKILL $195Bench 188%, 6,571 samples	207x

EDIT WITH CUSTOM PC BUILDER

Value: 90% - Outstanding

Total price: $2,582

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) October 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 3 months ago.

USA-User

level
10,000

Excellent (edit your comment) Add link

1 month ago.

TUR-User

level
5,606

Excellent

15 days ago.

but Samsung 990 pro 4tb is more better

SSDrivePro

level
1,921

Good

3 months ago.

arrxw

level
44

Excellent

18 months ago.

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

Your
opinion?

▲Like ▼Dislike

Over the hill
Age: 2 years

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 $159	Nvidia RTX 4060 $299	WD Black SN850X M.2 2TB $150
Intel Core i5-12400F $112	Nvidia RTX 4060-Ti $375	WD Black SN850X M.2 1TB $75
Intel Core i7-14700K $355	Nvidia RTX 4070 $500	Crucial T700 M.2 4TB $350

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/...

Excellent (edit your comment) Add link

Excellent

Good

Excellent

Speed Comparisons

Frequently Asked Questions

Best User Rated

		$28116 mins
		$31010 mins

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

Excellent

Good

Excellent

Speed Comparisons

Frequently Asked Questions

Best User Rated

Feedback

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