@kuhnikuehnast the on board 5V circuit (2A) provides sufficient power for a 7 inch PanelDue (the biggest "normal" current draw, along with the 3.3V regulator and other bits and bobs. If you have a large 5V power budget then you might want to provide external 5V power. Off the top of my head the only way this is likely to happen is if you are powering something unusual (like a raspi model B) along with everything else or you have a lot of high current 5V fans or something.
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