This article covers Western Digital ウエスタンデジタル WD_BLACK 内蔵SSD 4TB NVMe PCIe Gen5 x4 (読取り 最大 14.

Overview

Western Digital’s flagship gaming SSD, the WD_BLACK SN8100, now comes in a 4TB variant that pushes the boundaries of consumer storage performance. With sequential read speeds up to 14,900 MB/s and writes up to 14,000 MB/s, this drive fully exploits the PCIe Gen5 x4 interface. Random performance also impresses at 2.3M IOPS read and 2.4M IOPS write, making it ideal for heavy workloads like 8K video editing and high-frame-rate game streaming. This drive sits at the very top of the consumer NVMe SSD hierarchy, targeting enthusiasts who demand the absolute best. The 4TB model achieves this speed while drawing under 7W average power — over 100% more power-efficient than typical PCIe Gen4 drives. Western Digital’s nCache 4.0 technology combined with TLC 3D CBA NAND ensures sustained performance even during long write sessions, minimizing the dreaded post-cache slowdown. The 2,400 TBW endurance rating and 5-year warranty further reinforce its suitability for long-term, demanding use.

Compatibility Guide

The SN8100 uses the M.2 2280 form factor, compatible with most modern desktops, many laptops, and even the PlayStation 5 (though PS5 uses PCIe 4.0, limiting speed). The PCIe Gen5 x4 interface is backward-compatible with Gen4 and Gen3 slots, but maximum speeds will drop accordingly — around 7,000 MB/s on Gen4, and roughly 3,500 MB/s on Gen3. Ensure your motherboard has a PCIe 5.0 M.2 slot to unlock full potential. This is typically found on AMD AM5 platforms (Ryzen 7000 series and newer) and Intel LGA1700 motherboards with Z690/Z790 chipsets (some models only).

Product Info

Launched in late 2024, the WD_BLACK SN8100 is available in 1TB, 2TB, and 4TB capacities. The 4TB model carries a retail price around ¥210,000 (approx. $1,400 USD) on Japan, positioning it as a premium-tier product. The drive comes with a 5-year manufacturer warranty and boasts a TBW rating of 2,400 TB — one of the highest among consumer SSDs. This combination of speed, capacity, and endurance firmly places the SN8100 in the high-end enthusiast segment, best suited for those who need uncompromised performance.

Best Use Cases

First and foremost, hardcore gamers who play massive AAA titles will benefit from drastically reduced load times and faster texture streaming thanks to the SN8100’s random read performance. Secondly, content creators working with 4K/8K video or large 3D models will appreciate the sequential write speeds that slash project export times. Finally, PC builders planning a future-proof high-end rig — especially those already on a PCIe 5.0 platform — will find this SSD a worthy centerpiece for their storage subsystem. ## Alternatives
Direct competitors include the Samsung 990 Pro (PCIe 4.0) and the Seagate FireCuda 540 (PCIe 5.0). The Samsung 990 Pro is slower (~7,450 MB/s) but more affordable and widely available; it’s a better fit if you don’t have Gen5 support. The FireCuda 540 offers Gen5 speeds around 10,000 MB/s — still behind the SN8100 — and comes at a slightly lower price point. For users on a tight budget or with older platforms, a high-end Gen4 SSD like the WD_BLACK SN850X provides excellent real-world performance at a much lower cost. The SN8100 only makes sense if you can actually use PCIe 5.0.

Things to Consider

First, the SN8100 requires a PCIe 5.0 M.2 slot to deliver its advertised speeds; without it, you’re effectively overpaying for untapped potential. Second, thermal management is critical — the controller can get hot under sustained load, so you should use a robust heatsink (ideally the motherboard’s built-in Gen5 M.2 heatsink or an aftermarket cooler). Third, the ¥210,000 price tag is steep; for typical gaming or everyday tasks, a Gen4 drive will feel nearly identical in most scenarios. Lastly, verify that your motherboard’s M.2 slot supports PCIe 5.0 (check the manual) and that your system has adequate airflow. If you’re on a platform without Gen5 support, stick with a high-end Gen4 drive instead — you’ll save money without sacrificing real-world speed.

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: B0FB8MR7PG
  • Note: This article covers a manufacturer-made product based on Amazon listing details.