They are directly controlled by the voltage applied and normally that's either 5v or 7v low to 12v high. The CPU cooler fan alone should be plugged into the CPU_FAN header.ģpin fans are analog. So this Hub should be connected to the SYS_FAN header, and the actual CPU fan should NOT be connected to the Hub. OP wants to power and control fans for CASE cooling, not CPU cooling. The SYS_FAN header CAN be configured (should be for most situations) to use instead a temperature sensor on the MOTHERBOARD since it is trying to cool the whole case and especially the general motherboard components. The CPU_FAN header always governs its fan's speed according to the temperature sensor inside the CPU chip because it is designed to cool the CPU. The cable from the Hub to a mobo header can be plugged into either a CPU_FAN header or a SYS_FAN header. There is no speed control possible for the 3-pin fan in this mismatch situation. Although such devices CAN be used with 3-pin fans, and 3-pin fan plugged into a 4-pin port using PWM Mode will always run full speed. Like almost all such Hubs, that unit has outputs ONLY for 4-pin fans and using only the newer PWM Mode to control fan speeds.

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