Western Digital WD_BLACK SN8100 4000GB

The Western Digital WD_BLACK SN8100 is a PCIe 5.0 M.2 2280 SSD that uses a proprietary Western Digital NVMe controller paired with high-layer BiCS 3D TLC NAND. The 4000GB configuration includes a dedicated DRAM cache to maintain lookup table efficiency for sustained random I/O performance. The drive targets workstation and high-fidelity gaming use but generates significant heat at Gen5 throughput; thermal throttling can occur without a substantial heatsink or active cooling, with the controller targeting a maximum operating temperature of 85°C before aggressive throttling. The WD Dashboard "Game Mode 2.0" feature disables low-power states (APST/ASPM) to reduce latency, increasing idle power consumption.

Key Specifications

• Interface: PCIe Gen5 x4 / NVMe 2.0
• Controller: Proprietary Western Digital Gen5 Architecture
• NAND Flash: BiCS 3D TLC
• Sequential Read: 14,900 MB/s
• Sequential Write: 14,000 MB/s
• DRAM Cache: Yes (DDR4)
• Form Factor: M.2 2280
• Encryption: TCG Pyrite (Standard consumer implementation)
• Endurance: Scaled to capacity (typically ~2400 TBW for 4TB models in this class)

Hardware Alternatives

• Crucial T705 4000GB: The primary competitor in the saturation-level Gen5 space; uses the Phison E26 controller and Micron 232-layer TLC.
• MSI Spatium M570 PRO: Another Phison E26-based drive that matches the SN8100 in sequential throughput but relies on a different firmware optimization strategy.
• Samsung 990 PRO 4000GB: Currently PCIe 4.0, targets the same enthusiast demographic while the SN8100 offers a generational bandwidth leap.