This new ATX12VO Standard is meant to be more power-efficient for Alder Lake-S motherboards (while idle), but not so good when system is running at full load. I can see why manufacturers aren’t too eager to adopt it.
Taken from Videocardz … Intel expects broader support of a new power-efficient ATX12VO standard with Alder Lake-S, but neither motherboard nor power supply manufacturers are eager to participate.
The “Single Rail Power Supply Desktop Platform Form Factor ATX12VO” power standard is meant to increase the power efficiency of regular desktop power supplies. Some independent tests have shown that it can be so power-efficient that it reduces the power by half, but only when the system is idle. The ATX12VO standard does not quite offer the same power efficiency gains with the system under heavy load.
The new standard requires a motherboard with a new 10-pin power connector as well as a compatible power supply. The latter is not to feature any other power rails than 12V, which means voltages lower or higher than 12V would have to be directly converted by the motherboard itself, rather than the power supply. This increases the complexity of the motherboard.
Read more at Videocardz
