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I dont want to use PoE for the PIs because I would have to buy the HATs for that (and a PoE-switch). I use this powersupply to power the 2 fans in the top of the rack also.
Will buy this power supply: [link] has 10W/port what means at 5V you get 2A/port
Edit: will buy this article because the one above isn't compatible with my sockets... : [link]