The Raspberry Pi Compute Module 4 is loosely based on the Raspberry Pi 4B. The form factor of the new CM4 is different from previous Compute modules, which have all shared a form factor.

The Flash memory is connected directly to the processor on the board, however the remaining processor interfaces are available to the user via the connector pins. The electrical interface of the CM4 is via two 100-pin high density connectors. The footprint of the CM4 is now smaller with the new form factor design.

The CM4 is supplied with an onboard wireless module which supports:
- 2.4GHz, 5.0 GHz IEEE 802.11 b/g/n/ac wireless
- Bluetooth 5.0, BLE

If wireless is not required however, as the Raspberry Pi Compute Module 4 has an onboard Gigabit Ethernet PHY, you just need a standard 1:1 RJ45 MagJack to provide an ethernet connection to your CM4.

The CM4 has an internal PCIe (peripheral component interconnect express) 2.0 x1 host controller meaning the user can connect the board to high speed components such as GPUs, RAID cards, Wi-Fi Cards or Solid State Drives (SSD).

There are 28 pins available for general purpose I/O (GPIO) on the Compute Module 4 which match with the GPIO pins on the Raspberry Pi 4B 40-pin header. The pins have access to many internal peripherals such as I2C, PWM, SPI, UART and supports inputs (or outputs) of controllable micro controllers.

The Compute Module 4 supports Dual HDMI 2.0, CSI-2 (MIPI Serial Camera) as well as DSI (MIPI Serial Display). This means there are 6 ports capable of image display/capture at any one given time and they are supported by Official Raspberry Pi firmware.

For the first time the Raspberry Pi Compute Module is available in a huge number of technical variants, there are 32 choices available including with or without wifi and RAM and Flash sizes from 1GB to 8GB. Please download the lookup table for help choosing the right Compute Module 4 for you project.

Small Footprint 55mm x 40mm x 4.7mm with 4xM2.5 mounting holes
Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
Options for 1GB, 2GB, 4GB or 8GB LPDDR4-3200 SDRAM (depending on model)
Options for 0GB, 8GB, 16GB, or 32GB eMMC Flash memory (depending on model)
Option for Fully certified radio module with : ◦ 2.4 GHz, 5.0 GHz IEEE 802.11 b/g/n/ac wireless ◦ Bluetooth 5.0, BLE ◦ On board electronic switch to select between external or PCB trace antenna
1 x USB 2.0 port ( highspeed )
2 x HDMI 2.0 ports (up to 4kp60 supported)