The work of the motherboard is, to say the least, much finer when it comes to regulating the voltage, while the power supply does it in a more efficient but grosser way.
Thus, one of the reasons why this is done is because when converting the voltage, the power supply is better prepared and modifies it at source in a much more efficient way than the motherboard would do, which It would need to integrate much more advanced circuitry than they have today. Why isn’t a single voltage used?Įxplained this now comes the following question that curls the curl even more: why then does the source not supply the 12V voltage and that it is the motherboard that modifies it accordingly? The answer is as simple as it is simple: because it is much more efficient at converting voltage from a power supply than the motherboard. However, if a fan runs at 12V then it will use the 12V rail of course. So if 1.35V is needed for the RAM, the 3.3V rail from the source will be used to provide it because it is the closest. Now comes a slightly complicated concept, because if the source works with these three rails and the RAM, for example, it needs 1.35V to work, isn’t the source providing too much? Indeed, it is, but for that the motherboards have their own regulators and converters, so that they can modify the voltage supplied by the power supply to suit the needs of each hardware component that needs to be powered.Īs we’ve said, each component needs a certain voltage to function, and the source’s goal is to provide you with the closest voltage to what you need so that the motherboard has to work as little as possible, no more, no less.
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