Lexar NQ780 1000GB

The Lexar NQ780 functions as a specialized mid-range PCIe 4.0 NVMe solution that exhibits a distinct asymmetry between read and write throughput. The drive utilizes a DRAM-less architecture, leveraging Host Memory Buffer (HMB) technology to manage address mapping tables via the system’s RAM rather than onboard volatile cache. This configuration is likely paired with high-density 3D NAND—potentially QLC or lower-binned TLC variants—engineered to maximize sequential read velocities for access-heavy workloads while maintaining a simplified controller design.

Key Specifications

• Interface: PCIe Gen 4.0 x4, NVMe 1.4
• Form Factor: M.2 2280
• Sequential Read: Up to 6500 MB/s
• Sequential Write: Up to 2500 MB/s
• Architecture: DRAM-less Controller with Host Memory Buffer (HMB) support
• Physical Traits: Single-sided PCB design

Hardware Alternatives

• Lexar NM790 1000GB: The NQ780 is a downstream alternative to Lexar's NM series; it shares a DRAM-less design philosophy with the NM790 (Maxio MAP1602 controller based) but uses different NAND/controller binning, producing lower sustained write capabilities.
• Crucial P3 Plus 1000GB: Similar performance logic—high PCIe 4.0 read bandwidth but QLC NAND that restricts sustained write speeds, mirroring the NQ780’s asymmetrical throughput.
• Kingston NV2 1000GB: Direct competitor in the entry-to-mid Gen4 space; uses a variable BOM and DRAM-less architecture, competing with the NQ780 in burst read workloads.
• Solidigm P41 Plus: Comparable reliance on HMB and an optimized read-focus, though typically associated with a Silicon Motion controller ecosystem.