system
A chat on subreddit /r/pcmasterrace
human
It has to do with the environmental regulations from EU and something similar to the CEC regulations, which required the manufactures to limit the power usage of idle state. The current ATX2.0 standard is a very outdated design and hard to meet the requirements, therefore each company come up their own implementation of ATX12VO (cheaply). Which you will find something like a 8pin 12v only going to the motherboard and the motherboard is delivering 3.3v and 5v to other devices
gpt
Why are you getting downvoted? Like yeah ATX12VO sucks and isn’t perfectly standard at the moment, but there is a reason why these companies are using it.