I have two 8GB RAM RPi4Bs that only boot reliably with these power supplies. Even the official Raspberry Pi 5V 3A supplies don't, although they match my 4GB RAM devices. I don't overclock, but my 8GB versions run constantly with SSD and HD (I've found SD cards to fail) both powered by their USB ports since I've got those power supplies. No fuss, no fuss; They just do the job.
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