This article covers ウエスタンデジタル WD BLACK M.2 SSD 2TB PCIe Gen4.

Overview

The Western Digital WD BLACK SN850X is a high-performance NVMe M.2 SSD featuring a PCIe Gen4 x4 interface. With a 2TB capacity, it delivers sequential read speeds of up to 7,300MB/s and write speeds of up to 6,600MB/s. Designed for gaming PCs and creative workstations, this drive excels in DirectStorage-compatible titles and large-file workflows. This model comes without a heatsink, so pairing it with a motherboard heatsink or an aftermarket cooling solution is recommended for sustained performance.

Compatibility Guide

The WD BLACK SN850X uses the M.2 2280 form factor and requires a PCIe Gen4 x4 M.2 slot on your motherboard to achieve its full speed potential. It is backward compatible with PCIe Gen3 slots, though performance will be limited to Gen3 bandwidth. The drive supports the NVMe 1.4 protocol and works natively with Windows 10 and later, as well as major Linux distributions. It can also be used as internal storage expansion for the PlayStation 5, but you will need to install a compatible heatsink separately since this model does not include one.

Product Info

Released in 2022, the WD BLACK SN850X sits at the high end of the PCIe Gen4 SSD market. It carries a 5-year manufacturer warranty and an endurance rating of 1,200 TBW, which translates to roughly 657GB of writes per day over five years. Its market positioning is as a top-tier gaming SSD, competing directly with the Samsung 990 Pro and Seagate FireCuda 530 in terms of sequential throughput. The drive is available through major retailers and Western Digital's official store.

Best Use Cases

Gamers: Ideal for DirectStorage-enabled games that benefit from rapid asset streaming. Open-world titles and AAA blockbusters load significantly faster, reducing wait times and improving immersion. Content Creators: Video editors, 3D artists, and photographers working with large files will appreciate the high sequential speeds for faster project loading and export times. The 2TB capacity provides ample space for ongoing projects. * System Drive: Perfect for users who want the fastest possible OS and application boot times. When paired with a PCIe Gen4 motherboard, everyday tasks feel snappier and more responsive.

Things to Consider

Since this model lacks a built-in heatsink, thermal management is critical under sustained heavy loads. Without adequate cooling, the drive may throttle its performance to prevent overheating. If your motherboard does not have a dedicated M.2 heatsink, purchasing an aftermarket heatsink is strongly advised. Additionally, if you are using a PCIe Gen3 system, you will not achieve the advertised speeds, so ensure your platform supports Gen4 to justify the investment. Compared to the Samsung 990 Pro, some benchmarks show slightly lower random read/write performance, though the difference is rarely noticeable in real-world use. For most gamers and creators, the SN850X offers an excellent balance of speed, capacity, and reliability.

Product Disclosure (Amazon)

  • Manufacturer: ウエスタンデジタル(Western Digital)
  • Seller: プライムストア！
  • Fulfilled by: プライムストア！
  • ASIN: B0BBL2N1QS
  • Note: This article covers a manufacturer-made product based on Amazon listing details.