"Raspberry Pi 3 Model B SBC looks identical to the Pi 2 B at first glance. It is the same size and has much of the same components on board. So what is the difference? The new Pi 3 brings more processing power and on-board connectivity, saving you time with the development of your applications. Perfect for your Internet of Things (IoT) designs.
Pi 3 compared to Pi 2
* More processor speed. The CPU on the Pi 3 is one and a half times faster at 1.2 GHz. Your Pi board performs better.
* On-board connectivity. The Pi 3 features 802.11 b/g/n Wireless LAN and Bluetooth Classic & Low Energy (BLE). You can get connected much quicker without the need for any external device.
* 2.5 A power supply. With more processor speed and on-board connectivity, you'll need more power. Power supplies for previous Pi boards will not be sufficient. You will need the Official Raspberry Pi 3 Power Supply white or black."