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by naikrovek 977 days ago
power usage on a computer is not constant by any measure.

power usage spikes with CPU activity (among many other things) and if your power supply can't deliver the current that is required, voltage will drop, and things start failing, but only for 1ms or maybe even less. maybe even a single clock cycle in some cases.

if you can't keep the board powered fully for every clock cycle, then you are going to have problems, and that's true for any computer, not just the Pi.