Radxa launches NX4 SoM with Rockchip RK3576(J) industrial SoC and NX4IO carrier board

Radxa NX4 is a 260-pin SO-DIMM SoM built around the Rockchip RK3576(J) octa-core Cortex-A72/A53 industrial SoC with a 6 TOPS NPU for edge AI workloads. It supports up to 16GB LPDDR5 memory along with optional SPI flash, eMMC 5.1 (up to 256GB), or UFS 2.0 storage (up to 1TB).

Radxa has also introduced the NX4 IO carrier board for the module with an HDMI video output, two 4-lane MIPI CSI camera interfaces, four USB 3.2 Type-A ports, one USB 3.2 Type-C port, Gigabit Ethernet with optional PoE, and an M.2 M-key 2280 slot for storage, along with various I/Os.

Radxa NX4 SoM specifications:

• SoC – Rockchip RK3576J (industrial-grade version)
  • CPU – Octa-core CPU with 4x Cortex-A72 cores at 2.2 GHz, 4x Cortex-A53 cores at 2.0 GHz
  • GPU – Arm Mali-G52 MC3 GPU with support for OpenGL ES 1.1, 2.0, and 3.2, OpenCL 2.0, and Vulkan 1.2
  • NPU – 6 TOPS (INT8) AI accelerator with support for INT4, INT8, INT16, BF16, TF32 mixed operations.
  • VPU
    • Video Decoder
      • H.265, VP9, AV1, and AVS2 up to 8Kp30 or 4Kp120
      • H.264/AVC and MJPEG up to 4Kp60
    • Video Encoder – H.264, H.265, MJPEG up to 4Kp60
• System Memory – Up to 16 GB LPDDR5 5500 MT/s RAM
• Storage
  • Optional eMMC 5.1 flash up to 256GB
  • Optional UFS 2.0 up to 1TB
  • Optional onboard SPI flash
• Networking
  • Wi-Fi 6 + Bluetooth 5.4 module with external antenna support
  • Onboard RTL8211FSI-VS Gigabit Ethernet PHY
• 260-pin SO-DIMM edge connector  
  • Storage – SDMMC interface
  • Video Output – HDMI 2.1 up to 4K at 120 Hz
  • Camera – 2x 4-lane MIPI CSI
  • Audio – I²S interface, supports external audio codecs or DAC/ADC chips
  • Networking – Gigabit Ethernet
  • USB – 1x USB 3.2, 1x USB 2.0
  • PCIe – 1x PCIe 2.0 x1
  • Other I/Os – UART, I²C, CAN Bus, PWM, GPIOs
• Supply Voltage – 5V
• Dimensions –  69.6 x 45 mm
• Temperature Range
  • 0°C to 60°C (Commercial)
  • –40°C to 85°C (Industrial)

While writing the specification, I can see Radxa mentions I2S, PDM mic array support on its features page, but on the actual specification page, they only mention I2S support for the SoM.

The Radxa NX4 SoM can be paired with the NX4 IO Board, which gives access to HDMI display output, two 4-lane MIPI CSI cameras, USB 3.2 ports (four Type-A and one Type-C), Gigabit Ethernet with optional PoE, and an M.2 M-Key 2280 slot for NVMe SSDs. The board also features a 40-pin GPIO header with common serial interfaces, plus headers for a fan, RTC battery, CAN bus, buttons, and PoE, all powered from a power barrel jack supporting 9–20V DC input.

Radxa NX4 IO Board specifications:

• Compatibility – Radxa NX4 as described above
• Storage – M.2 M-Key 2280 slot for NVMe SSD
• Display – 1x HDMI output
• Camera – 2x MIPI CSI connectors, 4-lane each
• Networking
  • Gigabit Ethernet RJ45 port
  • PoE support (requires additional PoE HAT)
• USB
  • 4x USB 3.2 Type-A ports
  • 1x USB 3.2 Type-C port
• Expansion
  • M.2 M-Key 2280 socket
  • M.2 M-Key 2230 socket (but not supported by the NX4)
  • M.2 E-Key 2230 socket (but not supported by the NX4)
  • 40-pin GPIO header with I2C, SPI, UART, PWM, and GPIOs
• Mis
  • 4-pin PWM fan connector
  • 2-pin RTC battery connector
  • 4-pin CAN bus header
  • 12-pin Button Header
• Power
  • 9–20V DC via 5.5 × 2.5 mm DC barrel jack
  • 1x 2-Pin PoE Backpower Header
  • 1x 4-Pin PoE Header
• Dimensions – 100 × 79 mm

In terms of software support, Radxa mentions that the NX4 supports Debian Linux, Yocto Project, Buildroot, and Android 14. But I can only find that Debian (Bookworm) is available as a ready-to-flash image in the resource download section of the Getting Started guide. For Android 14, Yocto, and Buildroot, you must download the sources and build them locally. Android 14 is provided via the Radxa manifests repository, while Buildroot is available through Radxa’s own fork (specifically the rockchip/2024.02 branch), where it targets the RK3576 SoC configuration.

Previously, we have seen Radxa use the RK3576J on the Radxa CM4 SoM and the Radxa ROCK 4D SBC, and we have also written about the GrapeRain GR3576_CV2, another RK3576-based SoM that uses the same 260-pin SO-DIMM connector. However, it’s highly unlikely that those two boards are pin-to-pin compatible with each other.

The Radxa NX4 SoM is available on AliExpress for $82.22 to $219 (depending on the configuration), while the NX4 IO Board goes for  $92.80. More information can be found on the respective product pages for the SoM and the IO Board.

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