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This refers to the quad-core Raspberry Pi 2 (currently only available as a "B" model with Ethernet and four USB ports), with 1 gigabyte of RAM.

The Raspberry Pi 2 Model B differs from the Model B+ in two major points:

  • A 900 MHz quad-core ARM Cortex-A7 BroadComm 2836 CPU
  • 1 GB of RAM

The Raspberry Pi 3 Model B differs from the 2 B:

  • A 1.2 GHz quad-core ARM 7 BroadComm 2837 CPU
  • A Broadcomm BCM43143 to provide the USB Hub / Ethernet/ 2.4 GHz Wi-Fi / Bluetooth - replacing the LAN9512 or LAN9514 of previous 2 / 4 USB / Ethernet "B" Pi models.

https://www.raspberrypi.org/products/raspberry-pi-2-model-b/

See Also

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