This is a possibility, but future PC motherboards could only require a single 12V primary rail with +3.3V/+5V (-12V is only required for PCI slots (and certain cards thereof) but not PCI Express slots) switching regulator circuitry (which is now quite compact for their high output) on the motherboard with SATA power output connectors on the motherboard.
Most newer ATX (and related counterpart) power supplies over a certain wattage typically have a single primary rail of +12V which is then connected to independent +3.3V/+5V/-12V switching regulator modules; also, many hot swap server PSUs have a single primary rail of +12V.
Most newer ATX (and related counterpart) power supplies over a certain wattage typically have a single primary rail of +12V which is then connected to independent +3.3V/+5V/-12V switching regulator modules; also, many hot swap server PSUs have a single primary rail of +12V.
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