The initial Raspberry Pi 4 board had a design flaw where third-party e-marked USB cables, such as those used on MacBooks, incorrectly identify it and refuse to provide power. But the Pi can only be operated with 5 volts and not 9 or 12 volts like other mini computers of this class. The Raspberry Pi 4 is also powered via a USB-C port, enabling additional power to be provided to downstream peripherals, when used with an appropriate PSU. The 8 GB version has a revised circuit board. The version with 1 GB RAM has been abandoned and the prices of the 2 GB version have been reduced.
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