Radxa NX4 Packs 6 TOPS AI Power into a Compact RK3576J SoM

The 260-pin Radxa NX4 SoM features a 6 TOPS NPU and 8K decoding, offering a powerful, compact solution for industrial edge AI and multimedia applications starting at $55.

AI / ML Comm and Networking Memory February 25, 2026 by Sayantan Nandy

Radxa-NX4-SoM and IO Board

Radxa has unveiled the NX4, an inconspicuous SoM with dimensions of just 69.6 x 45 mm that is intended for multimedia, edge, and embedded applications. For edge AI workloads supporting popular deep learning frameworks, Radxa NX4 is a 260-pin SO-DIMM SoM based on the Rockchip RK3576(J) octa-core Cortex-A72/A53 industrial SoC with a 6 TOPS@INT8 NPU. In addition to optional SPI flash, eMMC 5.1 (up to 256GB), or UFS 2.0 storage (up to 1TB), it supports up to 16GB of LPDDR5 memory.

The multimedia capabilities of the device are outlined in its HDMI 2.1 output supporting a maximum resolution of 4K at 120Hz, dual MIPI CSI camera interfaces, and hardware video acceleration. H.265 encoding supports 4K at 60 frames per second and supports multi-format decoding (AV1, AVS2, VP9, H.265 and H.264) reaching a maximum of 8K at 30 frames per second depending on codec. The module’s networking and I/O capabilities are built on Gigabit Ethernet, an integrated Wi-Fi 6 & Bluetooth 5.4 chipset, support for USB 3.2 and USB 2.0, a PCIe 2.0 x1 interface and a diverse array of low-speed interfaces including UART, I2C, I2S, CAN, PWM and GPIO. To complement the device, Radxa has developed the NX4 IO carrier board that uses HDMI for video output, includes two 4-lane MIPI CSI camera interfaces, four USB 3.2 Type-A ports, one USB 3.2 Type-C port, support for Gigabit Ethernet and optional PoE, along with an M.2 M-key 2280 slot for storage, as well as a range of other I/O options.

Radxa NX4 SoM

Radxa NX4 SoM specifications:

SoC:  Rockchip RK3576J
- 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 supporting OpenGL ES 1.1, 2.0, and 3.2, OpenCL 2.0, Vulkan 1.2
- NPU: 6 TOPS (INT8) AI accelerator with support for INT4, INT8, INT16, BF16, TF32 computation precision
- 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 RAM @5500 MT/s; Memory bus width: 32-bit (dual-channel, 16-bit per channel)
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
- Additional I/Os: UART, I²C, CAN Bus, PWM, GPIOs
Supply Voltage: 5V DC
Dimensions: 69.6 mm x 45 mm
Temperature Range:
- Commercial Grade: 0°C to 60°C
- Industrial Grade: –40°C to 85°C

Radxa-NX4-SoM-Block-Diagram

Radxa-NX4-SoM and IO Board Peripherals

Radxa NX4 IO Board specifications:

Compatibility: Radxa NX4 SoM (aforementioned in details)
Storage: M.2 M-Key 2280 slot for NVMe SSD via 1x PCIe 2.0
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 (Reserved but not supported by the NX4)
- M.2 E-Key 2230 socket (Reserved but not supported by the NX4)
- 40-pin GPIO header with I2C, SPI, UART, PWM, and GPIOs
Misc:
- 4-pin PWM fan connector
- 2-pin RTC battery connector
- 4-pin CAN bus header
- 12-pin Button Header
Power Supply:
- 9 to 20V DC via 5.5 × 2.5 mm DC barrel jack
- 1x 2-Pin PoE Backpower Header
- 1x 4-Pin PoE Header
Dimensions: 100 mm x 79 mm

radxa nx4 dev kit view

Radxa’s NX4 system-on-module (SoM) has support for many software platforms: Debian, Yocto, Buildroot, and Android 14 for industrial applications, AIoT applications, and multimedia applications, and includes both commercial grade and industrial grade variants. There is a pre-built version of Debian (Bookworm) provided in the Getting Started Guide resource download area, while Android 14 can be found in Radxa’s manifest repository and Buildroot can be obtained through Radxa’s official fork. The provided documentation includes the configuration of the system, establishing network connections, using the hardware, as well as flashing tools, system images, and open hardware files such as schematics, pinouts, and mechanical drawings of both the module and IO board.