At a glance, the Raspberry Pi 3 is difficult to distinguish from its predecessor. It keeps to the same form factor - about the size of a credit card - and has most of its components and connectors in pretty much the same place. This includes the 40-pin header for connecting to other hardware, and the CSI and DSI flat cable connectors for the camera and display modules that are available as add-ons.
In fact, you would have to look very closely to notice that the Raspberry Pi 3 has a tiny new silver component on the underside of the board close by the micro SD slot (see picture above). This is the BCM43438 wireless chip that provides 802.11b/g/n WiFi and Bluetooth 4.1 capability.
Almost directly above it on the top side of the board is another tiny component that is the antenna, which has displaced the status LEDs to the opposite side of the DSI connector than they were on the Raspberry Pi 2.
The micro SD slot that provides the storage and boot media for the Raspberry Pi now appears to have changed from a click-in and click-out design to one where the card just pushes in and is held in place by friction.
Otherwise, the Raspberry Pi 3 is very similar to its predecessor, although Raspberry Pi Trading now recommends a 2.5A power adapter if you want to connect power-hungry USB devices, up from the 2A in the Raspberry Pi 2.
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