Raspberry Pi 2 was unveiled February 2, 2015 for sale at the same price as the existing Model B+. This has an identical form-factor to the existing Raspberry Pi 1 Model B+. All of the connectors are in the same place and have the same functionality, and the board can still be run from a 5V micro-USB power adapter. It also has complete compatibility with Raspberry Pi 1.
Like the (Pi 1) Model B+, it also has:
- 4 USB ports
- 40 GPIO pins
- Full HDMI port
- Ethernet port
- Combined 3.5mm audio jack and composite video
- Camera interface (CSI)
- Display interface (DSI)
- Micro SD card slot
- VideoCore IV 3D graphics core
Raspberry Pi 2 has a new System-on-Chip (SoC) BCM2836 900MHz quad-core ARM Cortex-A7 CPU and a full 1GB of LPDDR2 SDRAM. The new ARMv7 processor means it can run the full range of ARM GNU/Linux distributions, including Snappy Ubuntu Core, as well as Microsoft Windows 10. Raspberry Pi 2 has backwards-compatibility with all previous Raspberry Pi models but can, however, run “bigger and more powerful projects” owing to its upgraded CPU and RAM specifications.
Mike McGrath, author of Raspberry Pi in easy steps