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Yes, there is a low power mode. And you're forced to use that if you startup with an "under"-powered supply.

Jeff Geerling on YT has a great in-depth review of these options in his latest video.

I read a lot of Jeff's blog, but his vlogs put me to sleep. He isn't charismatic and makes the worst jokes. People forget that a visual medium is visual. He channel is an example of great information that is ruined by the visual medium.

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