N339905NAS is a customized industry-specific NAS server motherboard, using RK3399 as the main control chip, with 5 SATA hard disk interfaces and 2-way SATA hard disk power supply on board, supporting Gigabit Ethernet, 2.4G/5GHZ dual-band WiFi, TF card boot, USB interface, HDMI output interface, and can quickly land in scenarios with large storage requirements. RK3399 is a high-performance 64-bit domestic processor chip based on ARM architecture. It adopts the dual-core Cortex-A72 + quad-core Cortex-A53 big and small core CPU structure, integrates Mali-T860 MP4 high-performance GPU, supports 4K VP9 and 4K 10bits H265/H264 video decoding (60 frames), and has high-speed signal interfaces such as USB3.0/PCIE2.1. The chip is currently widely used in various embedded devices, with strong performance, stable and reliable development, and extremely high cost performance.