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Revised Raspberry Pi 5 chip comes with unexpected power savings
(arstechnica.com)
This is a most excellent place for technology news and articles.
5amp is a requirement. It will crash under load without it.
I know because I have personally experienced this.
Something is wrong with either your power supply, the cable, or the pi itself. Are you running any hats or any extra hardware? Mine runs just fine on a 3 amp power supply under full load.
Nothing but the bare pi and heatsink. Some full loads are fuller than others. In my case I tried running some tflite stuff.