Western Digital Black SN850X NVMe 4TB M.2 2280 PCI-E NVMe X4 Internal SSD

WD Black SN850X 4TB NVMe PCIe 4.0 M.2 2280 SSD with Heatsink — WDS400T2XHE

The WD Black SN850X (WDS400T2XHE) is a 4TB PCIe 4.0 NVMe M.2 2280 SSD with an integrated heatsink, combining massive capacity with superior thermal management. Built on 3D TLC NAND with GameMode 2.0 technology, it delivers sequential read speeds up to 7,300 MB/s. The heatsink variant is ideal for open-air gaming builds, workstations, and PS5 upgrades where sustained performance under thermal load is critical.

Key Specifications

Part Number / MPN: WDS400T2XHE

Manufacturer: Western Digital (WD)

Product Line: WD Black SN850X

Capacity: 4TB

Interface: PCIe 4.0 x4, NVMe 1.4

Form Factor: M.2 2280

NAND Type: 3D TLC NAND

DRAM Cache: Yes

Heatsink: Yes (integrated)

Performance

Sequential Read: Up to 7,300 MB/s

Sequential Write: Up to 6,600 MB/s

Random Read (4K): Up to 1,200,000 IOPS

Random Write (4K): Up to 1,100,000 IOPS

GameMode 2.0: Adaptive thermal and cache optimization for sustained gaming performance

Reliability & Endurance

TBW: 2,400 TBW

MTBF: 1,750,000 hours

Warranty: 5 years limited

• RoHS compliant

Features