Although I did some research I will still ask, maybe somebody come up with something new.
I have 9 node Rpi4B+ cluster Under load I have noticed that some nodes start getting Under-voltage errors. At the moment I'm powering them all from single USB hub I-TEC USB 3.0 Charging HUB 16port + Power Adapter 90 W which I hoped would be up to the task.
From what I understand the botched USB-C on rpi4 does not limit charging, just prevent it altogether if the charging cable have chip. ( mine does not )
There are also two flash drives in each node ( USB 3.0 )
What can I do ? Using PoE ... but all PoE hats I have seen supply just max 2.5A and rpi4 needs around 3A ( right ? ) Also since I have 9 nodes... well I can't find decent PoE switch that would not cost 250Eur+
Other option, get some random 12V power supply + 12V to 5V power convertor/bucks and wire it that way ( kind of messy solution )
What else is there ?