There are two giant upgrades in the Pi 3. The first is a next generation Quad Core Broadcom BCM2837 64-bit ARMv8 processor, making the processor speed increase from 900 MHz on the Pi 2 to up to 1.2GHz on the Pi 3.

The second giant upgrade (and this is the one we’re personally most excited about) is the addition of a BCM43143 WiFi chip BUILT-IN to your Raspberry Pi. No more pesky WiFi adapters - this Pi is WiFi ready. There’s also Bluetooth Low Energy (BLE) on board making the Pi an excellent IoT solution (BLE support is still in the works, software-wise)

Lastly, there’s an upgraded switched power source that goes up to 2.5 Amps instead of just 2 Amps - allowing your Pi to power even more powerful devices over USB ports.

The best part about all this is that the Pi 3 keeps the same shape, connectors, and mounting holes as the Pi 2. The only difference is a slight change in where the LEDs are. 99% of cases and accessories will still be fully compatible with the Pi 3, Pi 2, and Pi B + - though if you have a case with a metal top there might be some WiFi chip difficulties.

Raspberry Pi 3 - Model B Technical Specification
• Broadcom BCM2387 chipset
• 1.2GHz Quad-Core ARM Cortex-A53
• 802.11 bgn Wireless LAN and Bluetooth 4.1 (Bluetooth Classic and LE)
• 1GB RAM
• 64 Bit CPU
• 4 x USB ports
• 4 pole Stereo output and Composite video port
• Full size HDMI
• 10/100 BaseT Ethernet socketbr
• CSI camera port for connecting the Raspberry Pi camera
• DSI display port for connecting the Raspberry Pi touch screen display
• Micro SD port for loading your operating system and storing data
• Micro USB power source
SPECS
Model
Brand Raspberry Pi
Model Raspberry Pi 3 Model B
Combo Type Motherboard/CPU/VGA Combo
Bundle
Motherboard Raspberry Pi 3 Model B
CPU ARMv8 1.2GHz 64-bit quad-core CPU
Memory 1GB Ram
Memory
Maximum Memory Supported 1GB
Onboard LAN
LAN Speed 10/100Mbps
Wireless LAN WiFi IEEE 802.11 n
Bluetooth Yes