The Raspberry Pi Compute Module 4 IO board (CM4IO) is designed to assist in the development of products that make use of the Raspberry Pi Compute Module 4. The Raspberry Pi Compute Module 4 IO Board contains many of the interfaces that the Raspberry Pi 4, Model. The significant difference between CM4IO and Raspberry Pi 4, Model B is the addition of a single PCIe socket. The CM4IO has been designed as both a reference design for CM4 and to be used directly as a product with the possible addition of PCIe Cards and Raspberry Pi HATs.

• External +12V PSU
• 2 x full-size HDMI 2.0 connectors
• Gigabit Ethernet RJ45 with POE support
• 2 x USB 2 sockets, with a header for two more sockets
• Micro USB socket for updating the CM4 and micro SD card socket for CM4Lite modules
• PCIe Gen 2 socket
• Standard Fan connector
• External power connector (+5V, +12V)
• 2 x MIPI DSI display FPC connectors, 2 x MIPI CSI-2 camera FPC connectors
• RTC with battery socket and ability to wake up CM4