Not sure what ATX12VO has to to with that. Hardware still requires 5v and in some cases 3.3v. All that conversion is still going to happen it is now just taking up space on the motherboard reducing room for other features.
The screaming benefit is that ATX12VO is shooting for is super low load efficiency. Anything in the normal range is a wash.
The screaming benefit is that ATX12VO is shooting for is super low load efficiency. Anything in the normal range is a wash.