SanDisk WD Black SN8100

The WD Black SN8100 is a high-end PCIe 5.0 NVMe solid-state drive (SSD) manufactured by SanDisk, released in May 2025. It is SanDisk's flagship consumer SSD following the move of Western Digital's NAND-based products into the once again independent SanDisk. Despite being produced by SanDisk, the drive maintains the established WD Black, which takes aim at gamers and enthusiasts.

SanDisk's SN8100 is the first WD Black-branded product of its kind in the high-performance PCI-Express (PCIe) 5.0 consumer SSD market, succeeding the PCIe 4.0-based WD Black SN850X. The drive competes directly with other flagship PCIe 5.0 SSDs in the consumer market. Those include the Crucial T710 (which uses the same controller), a multitude of SSDs based on the Phison E26 controller, and the Samsung 9100 Pro.

The SN8100 stands out through superior power efficiency and thermal management compared to first-generation PCIe 5.0 drives, achieving performance levels comparable to or exceeding its competitors while not requiring aggressive cooling solutions – a significant advantage over earlier PCIe 5.0 implementations like the Crucial T700 and others.

Technical Specifications

Official datasheet

Controller

SanDisk uses a customized version of Silicon Motion's SM2508 controller for the WD Black SN8100. This eight-channel controller features four ARM Cortex-R8 cores, which is a significant architectural improvement over previous generations. SanDisk has modified the standard SM2508 with proprietary firmware and features including nCache 4.0 technology and "WD_BLACK Gaming Mode", which reviewers have noted provides substantial performance advantages over other SM2508-based drives. The controller supports data rates up to 3,600 MT/s per channel and includes end-to-end data path protection.

Cache Architecture

Unlike the company's mid-range WD Black SN7100 and entry-level WD Blue SN5100, the SN8100 comes with a physical DDR4 DRAM cache, at capacites varying by model: 1GB for the 1TB variant and 2GB for the 2TB and 4TB models. SanDisk's nCache 4.0 technology combines with the DRAM cache to optimize both sequential and random performance, benefiting small file operations and mixed workloads common in gaming and content creation scenarios.

NAND Type

The SN8100 uses the same memory chips as other 2025 SanDisk SSDs: Kioxia's 218-layer BiCS8 3D TLC (Triple-Level Cell) NAND flash memory with CBA (CMOS Bonded Array) technology. This generation of 3D NAND technology offers improved density, performance, and power efficiency compared to previous BiCS generations. The flash operates at 3,600 MT/s interface speeds and uses a four-plane architecture, which reviewers have noted contributes to superior random read performance and lower latency compared to competing six-plane designs.

Power Consumption

One of the SN8100's defining features is its industry-leading power efficiency for a PCIe 5.0 SSD. Average active power consumption ranges from 6.2W to 7.0W depending on capacity and workload, substantially lower than competing drives like the Crucial T705 (11.5W maximum) and comparable to many PCIe 4.0 SSDs. It features a PS4 sleep state consuming only 5mW, making it suitable for laptops. This efficiency translates to lower operating temperatures, with reviewers reporting typical temperatures around 50°C under load without active cooling, eliminating the need for dedicated cooling solutions required by many competing PCIe 5.0 drives.