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I have just put my board on a power meter.
Consumption of board with SD card and USB flash disk present is 3.3 W
When I started to use the SD card power usage went to 3.7 W.
When adding using the USB flash disk it went to 4.9 W
When then stopping SD card access it dropped to 4.3 W
(accessing = reading from the device with dd to /dev/null).
Of course this also includes inefficiencies of the power brick.
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