WD_BLACK 4TB SN8100

WD_BLACK 4TB SN8100 Review & Specifications

The WD_BLACK 4TB SN8100 by WD is a NVMe solid-state drive (SSD) featuring 4000 GB of storage. It is built with TLC 218-layer NAND flash memory and utilizes a (SMI) 2508 controller to manage data access, wear leveling, and overall performance. This model leverages the cutting-edge PCIe 5.0 x4 interface, delivering a theoretical maximum bandwidth of up to 32 GB/s. It also complies with the modern NVMe 2.0 specification, which introduces modular architecture, improved command sets, and support for Zoned Namespaces. The drive is available in a M.2 2280 form factor. Note that optimal performance requires a motherboard with PCIe 5.0 support; otherwise, the SSD will operate at the maximum speed allowed by your system configuration.

NVMe SSD Performance

Sequential read and write speeds reach 14900 MB/s and 14000 MB/s respectively, while random read/write performance delivers up to 2300k and 2400k IOPS. The drive offers an endurance rating of 1200 TBW and is backed by a 5-year manufacturer warranty.

This SSD includes a dedicated 4096 MB DRAM cache module running at 4266 MHz. This discrete DRAM chip serves as a high-speed buffer between the controller and NAND flash, significantly reducing latency and improving random read/write performance. DRAM allows the controller to store the Flash Translation Layer (FTL), which is essential for efficient address mapping and wear leveling. Combined with a Dynamic and static SLC write cache, it offers excellent burst speeds and consistent performance under heavy workloads.

This SSD module delivers ultra high-end performance, reaching 96.7% of the maximum score in our synthetic benchmark—measured relative to the fastest NVMe SSD in our database. It is engineered for cutting-edge gaming rigs, advanced workstation environments, and high-frequency data pipelines such as 4K/8K video editing, real-time rendering, and scientific data processing.

Cost-Effectiveness

From a cost-per-storage perspective, this SSD offers below-average value at $124.8 per terabyte. The overall combined performance-to-price ratio, which evaluates both maximum performance and total storage capacity per dollar, is calculated at 54.3%. Based on this metric, the drive is a less favorable value in this category. However, with a high raw performance rating of 96.7%, it may still appeal to users who prioritize speed and responsiveness over cost or capacity. For budget-conscious users, more balanced alternatives may be preferable.