Raspberry Pi 2 model B
The Raspberry Pi 2 rises to a new, higher level. A combination of about six times the computing power, doubled working memory and the downward compatibility to the B + model guarantee even more powerful and complex projects. The new features of the Raspberry Pi 2 make it the perfect board for professional and hobby users. With the new quad core processor and the very large 1GB RAM memory, the RPi2 has 6x more performance compared to the previous RPi boards, but the price has not changed significantly, and has even remained very cheap! This price-performance ratio is sure to be of great interest to the large Raspberry Pi community.

Raspberry Pi 2 - Model B Technical Data:

Broadcom BCM2837 ARMv7 Quad Core Processor
Computer clock speed 900MHz
1GB RAM memory
40pin extended GPIO interface
4 x USB 2.0 ports
4 pole jack socket for stereo audio output with composite video port
"Full size" HDMI video output
CSI connection for the Raspberry Pi cameras
DSI display port for connecting touch screen displays
Micro SD card slot for loading the operating system and for saving data
Micro USB connection for power supply
10/100 Ethernet port
Raspberry Pi 2 Model B Features:

6x faster thanks to the Broadcom BCM2837 ARMv7 Quad Core Processor with 900MHz clock
Double the main memory - 1GB RAM for even more complex and extensive applications
Layout identical to Model B +, all extensions of the RPi B + fully compatible with the B + 2
Completely HAT compatible
40pin GPIO connector and 100% compatible with model B + and A + boards. The first 26 pins are identical to Model A and Model B boards, so backwards compatible with all Raspberry Pi boards.
Connection for Raspberry Pi camera and touch screen display (accessories, not included)
Streaming and playing hi definition video in 1080P
Micro SD card slot for storing data and loading the operating system.
10/100 Ethernet port for easy, fast and wired connection to the network or the Internet
Combined 4-pin connector with stereo audio output and composite video out
Extended power supply:

USB ports can provide current of up to 1.2 amps? This means that power-hungry devices such as hard drives can be connected and supplied directly to your Pi. (Requires a 2A power supply!)