WSAL16784 – PI4B/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

Concise technical guide to the Raspberry Pi 4 Model B: SoC, RAM options, interfaces and setup via SD card.

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Technical overview

• Uses the BCM2711B0 (ARM Cortex-A72) as a 64-bit quad-core CPU at 1.5 GHz.
• Available in three RAM variants: PI4B-1GB, PI4B-2GB and PI4B-4GB.
• Interfaces include Gigabit Ethernet, USB 3.0 x 2, USB 2.0 x 2, two micro-HDMI ports (supporting 4Kp60), a MicroSD slot, a 3.5 mm audio jack, a 40-pin GPIO header, a CSI camera connector and a DSI display connector.
• Wireless: 802.11ac dual-band NIC (2.4/5 GHz) and Bluetooth 5.0/BLE.
• Power is supplied via USB Type-C at a minimum of 5 V / 3 A.
• PoE is possible through a PoE header when a compatible PoE HAT is used.
• Setup flow: format an SD card, flash the OS image, insert the card, connect the 5 V/3 A adapter; the power LED stays red and the ACT LED blinks green.
• Dual-screen touch mapping uses xinput map-to-output <touch ID> <HDMI ID>; persist it in /etc/xdg/lxsession/LXDE-pi/autostart.

Commands and examples – verify before use: 

xrandr
xinput
xinput map-to-output <touch ID> <HDMI-ID>
sudo nano /etc/xdg/lxsession/LXDE-pi/autostart

Notes and version constraints

• The source does not specify software versions or driver requirements; verify the latest official OS version before use.
• SD-card formatting depends on the tool used (the source mentions SDFormatter.exe); alternatives exist.
• PoE requires an additional HAT; without it the PoE header remains unused.
• For dual displays, the correct touch ID must be identified manually; if unclear which belongs to the main screen, test both IDs.
• The autostart entry must remain effective after each reboot; otherwise the command line has to be re-run.

Source and revision record

• PI4B - Waveshare Wiki
• Source revision: 104344
• Captured: 2026-08-31T03:50:53+00:00
• SHA-256: 716c65d5483054b9bcd12669917ad2223ccdb3fd011ecfd7069f6f2000f5e363