Western Digital WD_BLACK SN850X · WDS400T2X0E · 4000 GB

Model code

WDS400T2X0E

Manufacturer designation

WD_BLACK SN850X

Capacity

4 TB (decimal)

Storage protocol

NVMe

Write endurance

2400 TBW

Manufacturer limited-warranty conditions

5 years or TBW limit, whichever occurs first; regional terms apply

Interface

PCIe Gen4, 16 GT/s, up to 4 lanes

Form factor

M.2 2280

Application segment

Client gaming PC

Heatsink

Not included

Selection limits

Client SSD: confirm slot protocol, module size, firmware and host compatibility. Bare-drive model without factory heatsink.

Identifier scope

Documented model code. Regional ordering suffix and bundle are not invented and are confirmed separately.

Specification source: Western Digital ↗
Checked against documentation: 16.10.2026

“Up to” figures follow manufacturer test conditions; real throughput depends on workload and host system.