The Raspberry Pi 4 Model B is a credit-card-sized single-board computer with a quad-core ARM Cortex-A72 CPU, dual micro-HDMI output for 4K displays, USB 3.0 ports, Gigabit Ethernet and dual-band Wi-Fi. It is a big step up from the Pi 3: faster CPU, real Gigabit networking and proper dual-monitor support, which makes it usable as a light desktop. It suits hobbyists, students, home-server builders and tinkerers who want a cheap, well-supported Linux board. Rivals like the Pi 5 are faster, and the Pi 4 runs hot under sustained load, so a good case and cooling matter.
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Owners rate it very highly and treat it as the default hobbyist board. Praise centers on the speed jump over earlier models, the dual HDMI outputs and the networking. The main complaints are heat in the official case and the need for a strong USB-C power supply.
The Raspberry Pi 4 Model B is built around the Broadcom BCM2711 SoC. It has a 1.5 GHz quad-core ARM Cortex-A72 CPU made on a 28 nm process, VideoCore VI graphics and LPDDR4 memory. Gigabit Ethernet connects directly to the SoC instead of through USB.
It has two USB 3.0 ports, two USB 2.0 ports and two microHDMI ports. The 40-pin GPIO port is fully compatible and adds new features. The board is fully backward compatible with the Pi 3B+.
Power comes through USB-C and needs a 5V 3A supply. A microHDMI to HDMI cable is needed to connect a display. microHDMI is not the same as miniHDMI.
