Biwin M350 4000GB

The Biwin M350 4000GB is a DRAM-less M.2 NVMe SSD that pairs a Maxio MAP1602 controller with high-density 3D TLC NAND. It leverages Host Memory Buffer (HMB) to use system RAM for mapping tables, enabling mid-range PCIe 4.0 throughput without onboard DRAM. The high-density NAND allows a single-sided M.2 2280 design at 4TB for thermal efficiency in compact chassis. Sequential speeds are 6000 MB/s read and 5000 MB/s write, which do not saturate PCIe 4.0 x4 but provide a balanced performance tier. The Maxio controller is power-efficient, though 4TB NAND packages can generate concentrated heat during sustained writes; a motherboard heatsink is recommended. NAND suppliers may vary between production batches.

Key Specifications

• Interface: PCIe Gen 4.0 x4, NVMe 1.4
• Sequential Speeds: 6000 MB/s Read, 5000 MB/s Write
• Controller: Maxio MAP1602 (4-channel, ARM Cortex-R5 architecture)
• NAND Type: 3D TLC (Triple-Level Cell)
• DRAM Cache: No (HMB Supported)
• Physical Layout: Single-sided M.2 2280 PCB

Hardware Alternatives

• Acer Predator GM7: Shares the Maxio MAP1602 platform but often features more aggressive firmware tuning that pushes sequential speeds closer to the PCIe 4.0 interface limit.
• Lexar NM790: Uses the same Maxio MAP1602 controller with firmware tuning that can yield higher sequential throughput than the M350.
• Addlink S93: Direct hardware relative using the DRAM-less Maxio reference design, with similar endurance characteristics and random I/O performance.
• Western Digital WD_BLACK SN770: A DRAM-less PCIe 4.0 competitor using a proprietary SanDisk controller with similar sequential throughput (~5150 MB/s) but different NAND sourcing.
• Samsung 990 EVO: Operates in a similar performance bracket using a DRAM-less architecture, prioritizing power efficiency and thermal management over maximum bandwidth.