Western Digital BLACK SN850X 4TB M.2 2280 PCIe Gen4 x4 SSD With Heatsink

Overview

The Western Digital WDS400T2XHE-00BCA0 is a high-capacity 4TB NVMe solid state drive designed for M.2 2280 slots, utilizing a PCIe Gen4 x4 interface to deliver blazing-fast data transfer speeds of up to 7,300 MB/s for reads and 6,600 MB/s for writes. Its integrated heatsink ensures stable performance by managing heat during intensive tasks like gaming, video editing, and large file transfers. This SSD combines 3D TLC NAND technology with advanced firmware features to provide low latency, reliable endurance, and smooth multitasking for demanding users.

Key features

• Integrated heatsink that keeps the drive cool and maintains consistent speed during extended heavy workloads
• Game Mode 2.0 accessible via WD_BLACK Dashboard on Windows, allowing temperature monitoring, firmware updates, and gaming traffic prioritization
• Firmware optimizations including predictive loading, overhead balancing, and adaptive thermal management to prevent slowdowns
• Compact M.2 2280 form factor with PCIe Gen4 x4 interface enables easy installation without cables, ideal for small-form-factor builds
• High endurance rating of 2,400 TBW supports frequent writes and content creation over the drive’s lifespan
• Random read and write performance reaching over one million IOPS, ensuring fast game level loads and smooth 4K video scrubbing

Key specs

• Capacity: 4 TB
• Interface: PCIe Gen4 x4
• Form factor: M.2 2280
• Sequential read speed: up to 7,300 MB/s
• Sequential write speed: up to 6,600 MB/s
• Random read IOPS: 1.2 million
• Random write IOPS: 1.1 million
• Memory type: 3D TLC NAND
• Write endurance: 2,400 TBW
• Warranty: five-year limited

Connectivity and compatibility

This SSD fits into any desktop or laptop motherboard with an available PCIe Gen4 M.2 2280 slot, making it a versatile choice for performance-focused systems. Its cable-free design simplifies installation and reduces clutter, which is especially beneficial for compact builds. The drive is fully compatible with Windows systems that support NVMe storage and can leverage the WD_BLACK Dashboard software for enhanced control and monitoring.

Performance and reliability

With its advanced 3D TLC NAND and firmware features, this drive delivers consistent high-speed performance even under demanding workloads. The integrated heatsink prevents thermal throttling, ensuring that read and write speeds remain stable during long gaming sessions or intensive content creation. Its high endurance rating means it can handle frequent data writes without compromising reliability, making it suitable for users who regularly update large files or run heavy applications.

Ideal uses and environments

This SSD is well suited to gamers, creative professionals, and power users who need both large storage capacity and fast data access. It works well in desktop PCs, small-form-factor systems, and workstations where space is limited but performance cannot be compromised. The drive’s speed and endurance make it a strong choice for video editing, 3D rendering, and multitasking environments where responsiveness is critical.