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The Model B+ uses the same BCM2835 application processor as the Model B. It runs the same software, and still has 512MB RAM; but James and the team have made the following key improvements:
- More GPIO. : The GPIO header has grown to 40 pins, while retaining the same pinout for the first 26 pins as the Model B.
- More USB. : We now have 4 USB 2.0 ports, compared to 2 on the Model B, and better hotplug and overcurrent behaviour.
- Micro SD. : The old friction-fit SD card socket has been replaced with a much nicer push-push micro SD version.
- Lower power consumption.: By replacing linear regulators with switching ones we’ve reduced power consumption by between 0.5W and 1W.
- Better audio. :The audio circuit incorporates a dedicated low-noise power supply.
- Neater form factor.: We’ve aligned the USB connectors with the board edge, moved composite video onto the 3.5mm jack, and added four squarely-placed mounting holes.