Interestingly, the new generation of Intel chipsets could help simplify power. Currently, a PC power supply provides three voltages: 3.3 V, 5 V and 12 V (-5 V and sometimes for old ISA cards). Professional for chipsets with Sandy Bridge, we could move to a single voltage: 12 V. Indeed, in a typical PC, a lot of needs is on this tension and components that require a voltage of 5 V or 3.3 V are rare.
In practice, a PC used mainly for the 3.3 V PCI cards as standard chipsets professionals (Q65, Q67, B65, etc..) No longer handle, and 5 V is used mainly for storage devices (including SSDs). Overall, it is easier to transform the 12 V 3.3 V and 5 V on the motherboard in case of need rather than generating tensions in the diet itself.
Provide only 12 V supply simplifies the design allows for fast real power of it - avoiding power "450 W", which leave only 250 W at 12 V - and can offer a connector smaller. Remains to be seen whether this initiative will be a flop like the BTX power supplies remain so confined to the professional world or the PC classic will also pass to this new term. 
In practice, a PC used mainly for the 3.3 V PCI cards as standard chipsets professionals (Q65, Q67, B65, etc..) No longer handle, and 5 V is used mainly for storage devices (including SSDs). Overall, it is easier to transform the 12 V 3.3 V and 5 V on the motherboard in case of need rather than generating tensions in the diet itself.
Provide only 12 V supply simplifies the design allows for fast real power of it - avoiding power "450 W", which leave only 250 W at 12 V - and can offer a connector smaller. Remains to be seen whether this initiative will be a flop like the BTX power supplies remain so confined to the professional world or the PC classic will also pass to this new term.
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