Get the ultimate gaming edge over your competition with insane speeds up to 7,300 MB/s(1) for top-level performance and radically short load times.
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The WD_BLACK 4TB SN850X delivers Gen4 PCIe speeds up to 7,300 MB/s, cutting load times dramatically and keeping you in the action. With 4TB of capacity, you can store dozens of modern AAA titles without constantly juggling installs. This drive is built for gamers who refuse to compromise on performance or storage space.

What sets the SN850X apart is its intelligent performance optimization. Game Mode 2.0 automatically detects your games and adjusts settings for peak performance. Predictive Loading anticipates what data you’ll need next, while Adaptive Thermal Management keeps temperatures in check during marathon sessions. The WD_BLACK Dashboard gives you full control over drive health monitoring and performance tweaks, all through an intuitive Windows interface.

Who Is This For?

This drive targets serious PC gamers with extensive libraries who need both speed and capacity. If you’re tired of uninstalling games to make room for new releases, or you’re building a high-end rig that demands cutting-edge storage, the SN850X solves both problems. It’s also ideal for content creators who work with large video files and need fast read/write speeds for editing workflows. The 4TB model particularly suits anyone who plays multiple live-service games, keeps a backlog of favorites installed, or simply wants to future-proof their system as game file sizes continue to grow.

Bottom Line

The WD_BLACK 4TB SN850X combines flagship-tier speed with massive capacity at a competitive price point. You get Gen4 performance that rivals the fastest drives on the market, plus enough space to maintain a substantial game library. The intelligent performance features and DirectStorage support mean this drive will stay relevant as gaming technology evolves. For gamers who want to eliminate storage anxiety and maximize performance, this is one of the smartest investments you can make in your PC.

  • “Get the ultimate gaming edge over your competition with insanespeeds up to 7,300 MB/s(1) for top-level performance and radicallyshort loadtimes.”
  • “A range of capacities from 1TB to 4TB(2) means you get to keep more oftodays games that can take up 200GB(2) or more ofstorage.”
  • “The WD_BLACK Dashboard monitors your drives health, controls yourRGB style and can automatically detect games to turn on Game Mode2.0 (Windows only).”
  • “Predictive Loading, Overhead Balancing, and Adaptive ThermalManagement features come to the SN850X to juice up your gamingperformance.(3)”
  • “Supports future games developed for MicrosoftsDirectStoragetechnology for faster load times.”
  • “(1) Based on read speed. 1 MB/s = 1 million bytes per second. Based on internal testing; performance mayvary depending upon host device, usage conditions, drive capacity, and other factors.”
  • “(2) 1GB = 1 billion bytes and 1TB = 1 trillion bytes. Actual user capacity may be less depending on operatingenvironment.”
  • “(3) Requires the WD_BLACK Dashboard (Windows only)”