How to: Models of Raspberry Pi boards
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**Raspberry Pi 4 Model B**
[Check out the Raspberry Pi 4](https://www.raspberrypi.org/products/raspberry-pi-4-model-b/)

**Raspberry Pi 4 Model B Hardware Specifications**

 - Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
 - 2GB, 4GB or 8GB LPDDR4-3200 SDRAM (depending on model)
 - 2.4 GHz and 5.0 GHz IEEE 802.11ac wireless 
 - Bluetooth 5.0, BLE
 - Gigabit Ethernet
 - 2 USB 3.0 ports; 2 USB 2.0 ports.
 - Raspberry Pi standard 40 pin GPIO header (fully backwards compatible with previous Pi boards)
 - 2 × micro-HDMI ports (up to 4kp60 supported)
 - OpenGL ES 3.0 graphics

**Raspberry Pi 400 Personal Computer Kit**
[Check out the Raspberry Pi 400 Personal Computer Kit](https://www.raspberrypi.org/products/raspberry-pi-400/)

**Raspberry Pi 400 Hardware Specifications**

 - Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.8GHz
 - 4GB LPDDR4-3200 SDRAM 
 - 2.4 GHz and 5.0 GHz IEEE 802.11ac wireless 
 - Bluetooth 5.0, BLE
 - Gigabit Ethernet
 - 2 USB 3.0 ports; 2 USB 2.0 ports.
 - Raspberry Pi standard 40 pin GPIO header 
 - 2 × micro-HDMI ports (up to 4kp60 supported)
 - OpenGL ES 3.0 graphics
 
 **Raspberry Pi Pico Microcontroller**
[Check out the Raspberry Pi Pico](https://www.raspberrypi.org/products/raspberry-pi-pico/)

**Raspberry Pi Pico Hardware Specifications**

 - RP2040 microcontroller chip designed by Raspberry Pi in the UK
 - Dual-core Arm Cortex-M0+ processor, flexible clock running up to 133 MHz
 - 264KB on-chip SRAM
 - 2MB on-board QSPI Flash
 - 26 multifunction GPIO pins, including 3 analogue inputs
 - 2 × UART, 2 × SPI controllers, 2 × I2C controllers, 16 × PWM channels
 - 1 × USB 1.1 controller and PHY, with host and device support
 - 8 × Programmable I/O (PIO) state machines for custom peripheral support
 - Castellated module allows soldering direct to carrier boards
 - Drag-and-drop programming using mass storage over USB
 - Low-power sleep and dormant modes
 - Accurate on-chip clock
 - Temperature sensor
 - Accelerated integer and floating-point libraries on-chip

**Raspberry Pi OS. The default Operating System for every Raspberry Pi device**

[Check out Raspberry Pi OS](https://www.raspberrypi.org/software/operating-systems/)