Radxa CM4 is a high-performance system-on-module designed to bring the capabilities of the RK3576 processor to space-constrained and custom embedded applications. Built around a 55 mm × 40 mm compact form factor, CM4 is ideal for industrial control, edge computing, computer vision, and multimedia applications.

Powered by the Rockchip RK3576 or RK3576J SoC, Radxa CM4 features an octa-core CPU (4× Cortex-A72 + 4× Cortex-A53), Mali-G52 GPU, and a powerful 6 TOPS NPU, mak-ing it well-suited for AI and multimedia tasks. It supports high-speed LPDDR4x memory, onboard eMMC storage up to 256GB, optional UFS 2.0, SPI Flash, and SDMMC for flexible storage configurations.

With its powerful specs, industrial-grade reliability, flexible I/O via three 100-pin board-to-board connectors, and open ecosystem, Radxa CM4 is the ideal platform for building next-generation embedded systems and edge AI devices.

Note: The components on the Compute Module may be different on specific SKU such as the SKU without eMMC doesn't have the onboard eMMC mounted.


Block Diagram
As illustrated in the figure below, the CM4 block diagram showcases the intricate design and components of this powerful module.

To empower product developers and integrators, Radxa provides an official CM4 IO Board to help users quickly get started with prototyping and evaluation. The IO Board breaks out all major interfaces of CM4, including PCIe, USB, Ethernet, display, and camera connections.

All hardware design files for the CM4 IO Board - including schematics, PCB layout, and BOM - are open source and available on the Radxa Github for community access and customization.

Specification

• Product Name
  Radxa CM4
  
  
• Form Factor
  55 mm × 40 mm × 4.5 mm module
  4 × M2.5 mounting holes
  
  
• SoC
  Rockchip RK3576 or RK3576J
  
  
• CPU
  Quad-core Cortex-A72 (1MB L2) and Quad-core Cortex-A53 (512KB L2) ARMv8-A, TrustZone, Cryptography Extensions
  
  
• GPU
  ARM Mali G52 MC3
  
  
• NPU
  6 TOPS (INT8), supports INT4/INT8/INT16/FP16/BF16/TF32 compatible with TensorFlow, PyTorch, ONNX, etc.
  
  
• Memory
  LPDDR4/LPDDR4X (up to 4266MT/s) dual-channel 16bit, up to 16GB total address space
  
  
• Codec
  AV1 / AVS2 / VP9 / H.265 multivideo decoder up to 8K@30fps or 4K@120fps
  H.264 multivideo decoder up to 4K@60fps
  H.265 multivideo encoder up to 4K@60fps
  
  
• Storage
  Onboard eMMC Up to 256GB
  Optional onboard SPI Flash
  1x UFS 2.0
  1x SDMMC
  
  
• Ethernet
  1x Onboard Gigabit Ethernet PHY supporting IEEE 1588
  
  
• Video Input
  1x 4-lane MIPI CSI
  1x 4-lane MIPI CSI or 2x 2-lane MIPI CSI
  
  
• Video Output
  1x HDMI TX up to 4K@120Hz
  1x 4-lane eDP Interface up to 4K@60fps
  1x DP Interface up to 4K@120fps
  1x 4-lane MIPI DSI for MIPI LCD
  Able to provide 2x display output
  
  
• USB
  1x USB 3.2 Gen1x1 OTG / HOST
  1x USB 3.2 Gen2x1
  
  
• PCIe
  2x PCIe Gen2 1-lane
  
  
• SATA
  2x SATA 3.1
  
  
• Low Speed Buses
  SPI, I2C, I3C, UART, CAN
  
  
• Connector
  3x 100P 0.4mm pitch B2B connector

Operation Temperature
0°C to 60°C(Commercial Grade)
-40°C to 85°C(Industrial Grade)

Software

• Debian Linux support
• Yocto Linux support
• Buildroot support
• Android 14 support
• Rockchip RKNN SDK for AI model deployment

Pinout
The Pinout document for Radxa CM4 offers a detailed explanation of pin assignments and connectivity. You are welcome to visit Radxa CM4 Pinout to access this valuable resource. Download it for comprehensive information.

Mechanical Specification

Model and SKU

Availability
Radxa guarantees availability of the Radxa CM4 until at least September 2035.