SanDisk Extreme 1000GB

The SanDisk Extreme M.2 NVMe SSD utilizes Western Digital’s vertically integrated proprietary architecture, featuring an in-house controller specifically engineered for the mid-range PCIe 4.0 landscape. The drive employs a DRAM-less design, mitigating the lack of onboard volatile cache by leveraging Host Memory Buffer (HMB) technology to store logical-to-physical mapping tables directly in the system’s RAM. This controller interfaces with BiCS5 112-Layer 3D TLC NAND, prioritizing burst speeds and power efficiency over the sustained write capabilities found in enthusiast-tier drives with dedicated DRAM. It shares the same controller and NAND configuration as the WD_BLACK SN770, and uses an aggressive nCache 4.0 hybrid SLC caching strategy; once the cache is saturated, write speeds drop to native TLC levels. Thermal testing indicates the drive runs cooler than many Phison E18-based competitors, making it suitable for laptops or airflow-restricted builds without requiring a heavy heatsink.

Key Specifications

• Interface: PCIe Gen4 x4 / NVMe 1.4
• Sequential Read/Write: 5,150 MB/s Read / 4,900 MB/s Write
• Controller: SanDisk/WD Proprietary (20-82-10081/10082 variants)
• NAND Flash: BiCS5 112-Layer 3D TLC
• Cache: DRAM-less (Host Memory Buffer support)
• Form Factor: Single-sided M.2 2280
• Endurance: 600 TBW (Total Bytes Written)

Hardware Alternatives

• WD_BLACK SN770: This drive is the internal sibling to the SanDisk Extreme M.2; they share the same proprietary controller and BiCS5 NAND, offering a nearly indistinguishable performance profile in synthetic benchmarks.
• Lexar NM790: Utilizes the Maxio MAP1602 controller paired with YMTC 232-layer TLC, competing in the same DRAM-less segment and often achieving higher saturation speeds due to denser NAND layers.
• Samsung 990 EVO: A competitor from Samsung that also uses a DRAM-less architecture with HMB, targeting the same power-efficient, mid-range upgrade demographic.