ADATA LEGEND 860 1000GB

The ADATA LEGEND 860 1000GB is a mid-range PCIe 4.0 x4 NVMe solid-state drive built on a DRAM-less architecture. It uses Host Memory Buffer (HMB) to let the controller access a portion of system RAM for mapping tables, typically pairs a 4-channel controller with high-density 3D NAND, and is tuned for high sequential read throughput with a simplified PCB and lower power consumption compared to 8-channel flagship drives. The large gap between sequential read (6000 MB/s) and write (4000 MB/s) indicates reliance on dynamic pseudo-SLC caching, so sustained write workloads that exhaust the cache will fall back to native NAND speeds. Component sourcing can vary by batch (controllers from vendors such as Realtek or Silicon Motion), and the included heat spreader is a thin aluminum plate providing moderate thermal dissipation that depends on system airflow.

Key Specifications

• Interface: PCIe Gen4 x4 (NVMe 1.4)
• Sequential Read/Write: 6000 MB/s / 4000 MB/s
• Controller Architecture: DRAM-less with Host Memory Buffer (HMB) support; typically 4-channel
• NAND Type: 3D NAND (TLC in most revisions)
• Form Factor: M.2 2280 (Single-sided PCB design common for 1TB capacity)
• Endurance: Standard consumer endurance rating (typically aligns with industry average of ~600 TBW for 1TB capacity)
• Encryption: Supports AES 256-bit encryption
• Thermal solution: Thin aluminum plate heat spreader, moderate thermal dissipation relying on system airflow

Hardware Alternatives

• Western Digital WD_BLACK SN770 1000GB: A direct functional competitor sharing the same DRAM-less, high-performance PCIe 4.0 approach, using a proprietary SanDisk controller with similar read/write asymmetries.
• Lexar NM710: Occupies the same technical tier, utilizing a Maxio controller to deliver comparable sequential speeds without onboard DRAM.
• Silicon Power UD90 1000GB: Frequently uses similar reference designs and HMB implementations, offering nearly identical throughput profiles to the Legend 860.
• TeamGroup MP44L: Often built on similar reference designs (often Phison E21T or SM2269XT based), representing the generic Gen4 mid-range hardware standard.