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What is the purpose of rails in a computer power supply?
A computer’s power supply converts AC power into several DC voltages (typically plus and minus 3.3v, 5v and 12v), each of which is known as a rail. The term comes from the power lines on motherboards. Power must be available throughout a motherboard; hence, voltage lines tend to run in long strips like railroad tracks.
Is Molex a 5V?
All the other plugs coming out of the power supply—called Molex connectors—are for drives, and they provide +12V (yellow) and +5V (red) power, as well as two ground wires (black).
Can a PSU be converted to a bench power supply?
The standard computer power supply unit (PSU) turns the incoming 110V or 220VAC (alternating current) into various DC (direct current) output voltages suitable for powering the computer’s internal components and with a little bit of imagination it is possible to convert ATX PSU to a bench power supply.
What do you mean by rails in a PSU?
“Rails” is the term used to describe individual voltages within a power supply. In ATX12V PSUs 3.3V, 5V, 5Vsb, -12V, and +12V rails are present. Some manufacturers break the +12V into further separations for safety purposes, as described in the ATX12V 2.2 standard.
How many voltage rails does an ATX PSU have?
An ATX PSU (power supply unit) will always have four voltage rails — one each for +3.3 volts, +5 volts, +12 volts and -12 volts and sometimes there will be a fifth rail for -5 volts. These five voltages are made by connecting the negative DC terminal to the GND output and the positive terminal either to the +3.3v, +5v, -5v,+12v or -12v output.
How many rails are in a 12V power supply?
It should be noted that a 12v rail can be split into multiple 12v rails, in which case two 12v rails would provide half the wattage of the combined 12v capacity. “Rails” is the term used to describe individual voltages within a power supply.