Raspberry Pi Compute Module 4 IO board (CM4IO)
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 or to be used directly as a product with the possible addition of PCIe Cards and Raspberry Pi HATs.