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Tech Helproom

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Case fan wiring mods. Straightforward?


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This is probably one of those very silly questions, once you know, but as a first time builder....

If a case has fan speed control, and mobo has case fan control, presumably you can only use one, or other, presumably the mobo. If, then, the fans are three pin and the mobo fan plugs are four pin, is it relatively simple, just re-directing the cables, and using some sort of 3 to 4 pin adapter, or is it a bit more complicated than that? Mobo instructions just say WHERE to put FOUR pin plugs.

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Are we saying, up to four fans can be POWERED directly from mobo, but if I want mobo to provide tailored speed control, fans have to be changed (or get a case with 4 pin fans).

Yes,PC cases won't come with PWM fans fitted as standard. Depends on what your future case will be, if it comes with 200mm fans fitted then they're very quiet because of slow spinning, speed control may not be necessary.

Is the "normal" way to wire all fans to one central case control

External fan speed control normally has loads of molex power connectors for fans & is a real mess & nightmare for a neat & tidy cable management.

As a general rule, leave the big 200mm fans as they are if come with your case, change the 140mm to PWM one click here or 120mm to PWM one click here should you wish. Please remember all 3 pins fans still fit on the 4 pins connectors on the motherboard.

click here for a youtube demo of ASUS Fan Xpert 2 controlling PWM fans

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