Red line: +5V, the number of wires is equivalent to the yellow wire, +5V power supply is provided to the CPU and PCI, AGP, ISA and other integrated circuits of the working voltage, is the main working power supply of the computer. White line: -5V, there are few commercially available power supplies with white wires, -5V is also for the logic circuit to provide a judgment level, the current required is very small.
Orange line: +3. 3V This is specially set up by the ATX power supply to provide power to the memory. Purple cable: +5VSB (5V standby power supply) ATX power supply provides +5V 720MA power supply to the mainboard through PIN9, this power supply provides power for WOL(Wake up On Lan) and power-on circuit, USB interface and other circuits.
As long as the voltage match can also be used on other devices, the working voltage of common devices is 5v and 12v. For example, a 5v voltage is used to charge a mobile phone. Use 12v voltage to power the monitor or set-top box. However, the computer power supply is not a dedicated power supply for the above equipment, it is recommended to use a dedicated power supply for the equipment.
There is usually a 3.3V power socket on the motherboard that supplies 3.3 volts of direct current. This jack is usually located near the power plug area on the motherboard, and may also be in some other location, such as above the CPU slot or PCI slot. 3.3V power supply is widely used in digital circuits, storage devices and some circuits in the CPU, so on the PC or server motherboard, there are usually some circuits and components related to 3.3V power supply, such as 3.3V regulator, 3.3V power supply detection circuit. If some circuit modifications or hardware repairs are to be carried out, special attention needs to be paid to the location and use of these circuit components and plugs.
The role of 3.3v is getting smaller and smaller, resulting in some motherboards do not set 3.3v voltage monitoring circuit.
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At present, it is mainly used for CPU, memory and motherboard north bridge, video card and other I\/O circuits.