A 3-pin case fan can be connected to a 4-pin connector on the motherboard without any problems. In most cases, it will then run unregulated at a fixed speed. Some newer boards offer the option to adjust the fan speed using voltage. To do this, look for the "Fan Control Mode" option and change it from "PWM" to "Voltage" or "Analog." See your motherboard’s manual for exact information.
With the Case Fan Hub, only one PWM signal can be set for all connected fans. Voltage control via the Case Fan Hub is not possible because it uses a SATA power source.
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