Network World 10 Reasons why the Raspberry Pi 2 Model B is a killer product Network World The previous models used a 700 MHz single-core ARM1176JZF-S processor while the Raspberry Pi 2 Model B has upped the ante to a 900 MHz quad-core ARM Cortex-A7, a considerably faster CPU.

Continued here:
10 Reasons why the Raspberry Pi 2 Model B is a killer product – Network World