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WD Black SN850X WDS400T2X0E 4 TB
without radiator

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WD WDS400T2X0E
2022Black (consumer high class)PCIe 4.0NVMeDRAM buffer5 years
1 TB
without radiator
1 TB
with radiator
2 TB
without radiator
2 TB
with radiator
4 TB
without radiator
4 TB
with radiator
8 TB
without radiator
8 TB
with radiator
Placement
internal
Volume
4 TB
Form factor
M.2
M.2 interface
PCIe 4.0 4x
Controller
SanDisk 20-82-20035-B2
Cache memory
4000 MB / DDR4 /
Memory type
3D TLC NAND
Number of 3D NAND layers
SanDisk 112-layer BiCS5
NVMe
Write speed
6600 MB/s
Read speed
7300 MB/s
Write IOPS
1100 K
Read IOPS
1200 K
TBW
2400 TB
DWPD
0.3 times/day
Manufacturer's warranty
5 years
TRIM
Size
22x80 mm
Weight
8 g
Official Website
shop.sandisk.com
Added to E-Catalog
September 2022
E-Catalog UK editor, SSD
Valerii Lenko, edited 10.04.2026
The information in the model description is for reference purposes.
Always clarify the specifications and configuration of the product with the online store manager before purchasing.
Catalog WD 2026 - new arrivals, bestsellers, and the most relevant models WD.
TLC, QLC, MLC, SLC: which type of drive memory is better?Important differences between the types of NAND memory TLC, QLC, MLC, SLC, which determine the scope of their use and development prospects
How to choose the right SSDChoosing an SSD with the required speed and good reliability for home, work and gaming

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without radiator

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WD WD Black SN850X 4TB SSD M.2 2280 NVME PCI-E Gen4 Solid State Drive (WDS400T2X0E) WDS400T2X0E

Unlock blisteringly fast load and boot times courtesy of the WD Black SN850X 4TB NVMe PCIe 4.0 M.2 SSD. Armed with 4TB of sto... morerage, you’ll never need to worry about running out of space for your expanding gaming library, precious memories, work projects, and much more. PCIe 4.0 connectivity facilitates incredible data transfer rates for rapid responsiveness as and when you need it most. What’s more, thanks to 7300MB/s read and 6600MB/s write speeds, enjoy near-instant access to your files along with ultra-fast in-game load times. WD Black SN850X 4TB NVMe PCIe 4.0 M.2 SSD at a Glance: 4TB capacity 2280 M.2 form factor 7300MB/s read speed 6600MB/s write speed PCIe 4.0 connectivity Incredible Storage The WD Black SN850X 4TB NVMe PCIe 4.0 M.2 SSD has been engineered with gamers in mind, optimised to revolutionise your experience and keep you dominating the battlefield for longer. Harness the 4TB capacity to store your expanding library of games, precious family memories, music, and so much more. Thanks to rapid data transfer rates, you can quickly edit your files as and when you need to. What’s more, powerful PCIe 4.0 connectivity facilitates incredible responsiveness as you work or play, reducing unwanted lag or latency interrupting your workflow. In addition to this, 7300MB/s read and 6600MB/s write times deliver blazing fast in-game load times, eliminating any need to wait around while your favourite game boots up. Onboard technology, such as Game Mode 2.0, grants access to even more performance-driven features like load prediction to keep games running smoothly and assets loading faster. The 2280 M.2 form factors mean this SSD is compatible with a wide range of modern-day motherboards that feature a suitable M.2 slot. Plus, the sleek all-black look is sure to blend into the interior of your chassis with ease.
Overclockers.co.uk
Delivery: to United Kingdom
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£499.99
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Western Digital Black SN850X 4TB M.2 2280 NVMe PCIe 4.0 SSD Solid State Drive WDS400T2X0E

Know more about different features of WDS400T2X0E Western Digital SN850X 4TB M.2 PCIe 4.0 QLC Solid State Drive - NVME at bes... moret online technology store.
Box.co.uk
Delivery: to United Kingdom
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£554.04
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Western Digital WDS400T2X0E internal solid state drive 4 TB M.2 PCI Ex

Western Digital WDS400T2X0E internal solid state drive 4 TB M.2 PCI Express 4.0 NVMe 3D TLC NAND Built for elite gaming.Crush... moreload times and slash throttling. lagging. and texture pop-ins with the WD_BLACK SN850X NVMe™ SSD. Available in capacities of 1TB up to 8TB2. this gaming drive is built for top-tier performance. With 7.300MB/s1 speeds (1TB - 4TB models) and a heatsink option to maintain performance. you can enjoy your favorite games without worrying about lag. Plus. the downloadable WD_BLACK Dashboard (Windows® only) can automatically turn on Game Mode 2.0 features. The WD_BLACK SN850X NVMe™ SSD delivers a smooth. fast experience —and the innovations that let you compete at your absolute peak.Gain the Ultimate Gaming EdgeInsane speeds up to 7.300 MB/s1 (1TB - 4TB models) deliver top-tier performance with ridiculously short load times — for the elite gaming experience you’ve been waiting for.Heatsink for the WinAll capacities have an optional heatsink version that's not only eye-catching. but also helps your rig maintain peak performance through your most intense gaming sessions.More Room for More GamesCapacities up to 8TB2 built with Western Digital TLC 3D NAND. means you get to keep more games at the ready — and get into the action even faster.Do more with WD_BLACK DashboardThe downloadable WD_BLACK Dashboard (Windows® only) monitors your drive’s health. lets you customize your RGB lighting. and. exclusively on the SN850X SSD. enables Game Mode 2.0 to transform your gaming experience.Future-forward featuresThe WD_BLACK SN850X SSD boasts a powerful suite of features. including Predictive Loading. Overhead Balancing. and Adaptive Thermal Management5.DirectStorage SupportedImprove load times and get precious time back with Microsoft® DirectStorage technology.
Pcnova.co.uk
Delivery: in United Kingdom
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£567.82
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WDBLACK SN850X NVMe SSD WDS400T2X0E - SSD - 4 TB - PCIe 4.0 x4 (NVMe)

WD_BLACK SN850X NVMe SSD WDS400T2X0E - SSD - 4 TB - PCIe 4.0 x4 (NVMe)
Business.Currys.co.uk
Delivery: to United Kingdom
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£569.47
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Western Digital WDS400T2X0E. SSD capacity: 4 TB SSD form factor: M.2 Read speed: 7300 MB/s Write speed: 6600 MB/s

The Ultimate X FactorN/AStrap in for breakneck gaming speeds with the WD_BLACK SN850X NVMe SSD. Crush load times and slash th... morerottling lagging and model pop-ins for a smooth fast experience that lets you compete at your absolute peak. This purpose-built gaming drive comes in capacities of 1TB to 4TB with an optional heatsink on the 1TB and 2TB drives to help sustain top-end performance for more consistent gameplay. With the advanced features of Game Mode 2.0 (Windows only) plus speeds that approach the limits of the PCIe Gen4 interface the WD_BLACK SN850X NVMe SSD delivers top-tier performance to keep you playing streaming recording and dominating the game.N/AN/AGet the Ultimate Gaming EdgeN/AInsane speeds up to 7300 MB/s deliver top-tier performance with ridiculously short load times for the elite gaming experience youve been waiting for.N/AN/ASoup Up Your RigN/AExtremely low latency loads graphics fast with minimal stutter and lagging for an incredibly smooth satisfying gaming experience.N/AN/AMore Room for More GamesN/ATodays A-list titles can take up 200GB or more of storage. A range of capacities from 1TB to 4TB means you get to keep more games at the ready and get into the action fast.N/AN/AHeatsink for the WinN/AThe WD_BLACK SN850X NVMe SSD 1TB and 2TB drives have an optional heatsink version that not only looks awesome but also helps your rig maintain peak performance through the most intense gaming sessions.N/AN/AGame Mode 2.0N/AThe latest version of Game Mode serves up even more PC performance-boosting features like load prediction to ready game assets for fast in-game loading.N/AN/ANear-Max PCIe Gen4 SpeedsN/AThe WD_BLACK SN850X NVMe SSD delivers output approaching the limits of the PCIe Gen4 interface to help you get ultra-fast performance out of your storage and system components.
Quzo.co.uk
Delivery: to United Kingdom
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£571.57
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Series WD Black (consumer high class)Compare using chart →
Model overview based on user reviews  
WD Black SN850X is a high-performance PCIe 4.0 NVMe SSD aimed at gaming PCs and PS5 systems. It delivers strong sequential and random performance, improved write behavior over the previous SN850, and offers capacities up to 8 TB. Sustained workloads can produce high temperatures, especially without a heatsink, while Game Mode 2.0 currently provides limited and workload-dependent benefits.
Pros

Cons

User reviews 2
Write Review →
High-quality SSD with low temperatures
2 December 2025 
A good SSD that is on par with the KC3000, but runs hotter. It's almost the same drive, but with some minor drawbacks in terms of temperature. The drive itself is quite high-quality and maintains normal temperatures under the motherboard's secondary heat sink.
Cache, quality, similarity to KC3000
Temperature in some scenarios
Sriblo: use WD WDS100T2X0E more than year
Comments 1
Discuss
 Show Original
wonderful model, really honored
23 August 2024 
Corresponds to the declared speeds
Not a bad price/performance ratio
I still peeled off the sticker, under the native x570 radiator, after running CrystalDiskMark, it was 5 degrees lower at the peak
Dmitriy Mitus: use WD WDS200T2X0E less than month
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WD Black SN850X WDS400T2X0E configurations

Price for WD Black SN850X WDS400T2X0E
WD Black SN850X WDS100T2X0E 1 TB
without radiator
from £185.8213 offers
WD Black SN850X WDS100T2XHE 1 TB
with radiator
from £135.747 offers
WD Black SN850X WDS200T2X0E 2 TB
without radiator
from £211.9512 offers
WD Black SN850X WDS200T2XHE 2 TB
with radiator
from £350.006 offers
WD Black SN850X WDS400T2X0E 4 TB
without radiator
from £499.999 offers
WD Black SN850X WDS400T2XHE 4 TB
with radiator
from £544.994 offers
WD Black SN850X WDS800T2X0E 8 TB
without radiator
from £1,384.164 offers
WD Black SN850X WDS800T2XHE 8 TB
with radiator
from £1,411.143 offers
Video reviews
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