What are the physical dimensions and weight of this SSD with heatsink?

The drive measures 10.31 mm in height, 24.46 mm in width, and 80 mm in depth, and it weighs 30.4 g.

What is the sequential read speed of this WD_BLACK SN850X 4TB SSD?

It offers up to 7,300 MB/s maximum sequential read speed.

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Item#: 9SIC7XKM1R4116

GIGABYTE Z890 AORUS MASTER Ultra Core (Series 2) LGA 1851, ATX, DDR5, 5x M.2, PCIe 5.0, Thunderbolt 4, WIFI7, 10GbE LAN, EZ-Latch

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WD_BLACK 4TB SN850X NVMe Internal Gaming SSD Solid State Drive with Heatsink - Works with Playstation 5, Gen4 PCIe, M.2 2280, Up to 7,300 MB/s - WDS400T2XHE

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Options: 4TB SN850X w/ Heatsink

8TB SN850X w/ Heatsink
8TB SN850X w/o Heatsink
4TB SN850X w/ Heatsink
4TB SN850X w/o Heatsink
2TB SN850X w/ Heatsink
2TB SN850X w/o Heatsink
1TB SN850X w/ Heatsink
1TB SN850X w/o Heatsink

TRANSFORM YOUR PC. Get top-tier performance and ridiculously short load times for your gaming PC or workstation with insane speeds up to 7,300 MB/s (1TB – 8TB models).
MORE ROOM, MORE GAMES. Capacities up to 8TB built with Western Digital® TLC 3D NAND, means you get to download more games — and stop deleting your favorites.
HEATSINK FOR THE WIN. All capacities have an optional heatsink version to help maintain peak performance through your most intense gaming sessions.
DO MORE WITH DASHBOARD. The downloadable WD_BLACK™ Dashboard (Windows® only) monitors your drive’s health, lets you customize your RGB lighting (heatsink versions only), and can automatically detect games to turn on Game Mode 2.0.
FUTURE-FORWARD FEATURES. The WD_BLACK™ SN850X boasts a powerful suite of features, including Predictive Loading, Overhead Balancing, and Adaptive Thermal Management (ATM).

🔥Don't forget your OS, we have Windows 11 OEM, Download and USB versions available

Overview

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Crush load 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/s1speeds (1TB - 4TB models) and a heatsink option to maintain performance, you can enjoy your favorite games without worrying about lag.?

Performance
Max Sequential Read	Up to 7300 MBps
Max Sequential Write	Up to 6600 MBps
4KB Random Read	Up to 1,200,000 IOPS

Details
Form Factor	M.2 2280
Capacity	4TB
Interface	PCI-Express 4.0 x4

Performance
4KB Random Write	Up to 1,100,000 IOPS

Environmental
Power Consumption (Active)	Average Active Power: 65mW Maximum Operating Power: 8W
Power Consumption (Idle)	PlayStation: 5mW
Max Shock Resistance	1,500G @0.5 ms half sine
Max Vibration Resistance	Operating Vibration: 5 gRMS, 10-2000 Hz, 3 axes Non-operating Vibration: 4.9 gRMS, 7-800 Hz, 3 axes

Model
Brand	Western Digital
Series	Black
Model	SN850X
Part Number	WDS400T2XHE
Used For	Consumer

Details
Protocol	NVMe
Cache	4GB DRAM

Performance
Terabytes Written (TBW)	2400TB
MTTF	1.75M Hours
HeatSink	with HeatSink

Features
Features	Gain the ultimate gaming edge Insane speeds up to 7,300MB/s (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 win All 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 games Capacities up to 8TB 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 Dashboard The 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 features The WD_BLACK SN850X SSD boasts a powerful suite of features, including Predictive Loading, Overhead Balancing, and Adaptive Thermal Management (ATM). DirectStorage supported Improve load times and get precious time back with Microsoft DirectStorage technology.

Environmental
Operating Temperature	32°F to 185°F (0°C to 85°C)
Storage Temperature	-40°F to 185°F (-40°C to 85°C)

Dimensions & Weight
Height	10.31mm
Width	24.46mm
Depth	80mm
Weight	30.4g

Additional Information
First Listed on Newegg	July 18, 2026

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WD_BLACK 4TB SN850X NVMe Internal Gaming SSD Solid State Drive with Heatsink - Works with Playstation 5, Gen4 PCIe, M.2 2280, Up to 7,300 MB/s - WDS400T2XHE

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Customer Reviews of the SanDisk SN850X

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Item#: 9SIC7XKM1R4116

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Sponsored Products

WD_BLACK 4TB SN850X NVMe Internal Gaming SSD Solid State Drive with Heatsink - Works with Playstation 5, Gen4 PCIe, M.2 2280, Up to 7,300 MB/s - WDS400T2XHE

Learn more about the SanDisk SN850X

Customer Reviews of the SanDisk SN850X

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info