COMPUTER HARDWARE
MOTHERBOARDS AND EXPANSION CARDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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temperature monitoring
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fan speed control
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error reporting
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electric fault protection
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Detailed explanation-1: -In addition to the power, ground, and tach signal, 4-wire fans have a PWM input, which is used to control the speed of the fan.
Detailed explanation-2: -It is also possible to install a 4-pin fan on a 3-pin connector. Here the fan runs at full speed, too, provided the type of control has not been modified. Only one PWM signal for all fans can be set with the Case Fan Hub.
Detailed explanation-3: -The significant difference in practice is that 4-pin fans allow for RPM to change based on the need for cooling temperature, this reduces noise and power consumption. While 3-pin can control the voltage, but the voltage can’t turn to change the fan RPM at all and accurate as much as 4 pin fans.
Detailed explanation-4: -The reason is quite simple: The 4-pin PWM header is used to control the cooling fan that’s attached to the enclosure. Most modern motherboards are likely to be equipped with such a header, which is connected to a PWM-supported BLDC fan.
Detailed explanation-5: -Yes, 3-pin headers are for DC controlled fans, so if you are using a 4–pin splitter the pin-4 would be for PWM control and since your motherboard doesn’t provide PWN control at that header the 4th pin of your splitter will be connected to nothing.