[SOLVED] How to correctly wire my fan

[MrWolfyy]

Hello, I recently bought a fan and quickly realized my my motherboard has no other controllable fan slot.
I tried to hook the wires to psu instead but the psu power cables have 3 color, Red-Black-Black-Yellow, while the fan cables are 4 color, Blue,Green,Black,Yellow.
From my understanding, psu cable has +5V - Ground - Ground - +12V and the fan cable is Control - Sense - Ground - +12V . I tried different combinations, but only yellow fan wire to +5V and Ground to Ground seems to work.
Why wouldn't +12 to +12 and Ground to ground not work? I know a little about PWM and hooking the control to +5V should also give full speed but it does not. What am I missing?

 

[xenthia]

Hello, I recently bought a fan and quickly realized my my motherboard has no other controllable fan slot.
I tried to hook the wires to psu instead but the psu power cables have 3 color, Red-Black-Black-Yellow, while the fan cables are 4 color, Blue,Green,Black,Yellow.
From my understanding, psu cable has +5V - Ground - Ground - +12V and the fan cable is Control - Sense - Ground - +12V . I tried different combinations, but only yellow fan wire to +5V and Ground to Ground seems to work.
Why wouldn't +12 to +12 and Ground to ground not work? I know a little about PWM and hooking the control to +5V should also give full speed but it does not. What am I missing?

Usually speaking some fans also need a controlling signal and a sensor, they can vary, simply connecting a +-12V can kill your fan. But if this is a fan with only two wires then you shouldn't worry.

PS: I learned this the hard way by burning a CPU fan before.

 

[helpstar]

which fan model did you buy?

 

[MrWolfyy]

which fan model did you buy?

It is an Akasa Viper 12cm

 

[Paperdoc]

The COLOUR of the wires does NOT tell you what you need, because the colour codes used for Molex 4-pin power outputs from a PSU are NOT the same as what is used for a 4-pin PWM fan. But before I answer your original question about what wires to splice, what about the common way to do this? You said, "my motherboard has no other controllable fan slot." By that I suspect you MAY be saying that your mobo does have one or more fan headers available, but they are all in use. Now, the fan you describe has 4 wires from it to a connector with 4 pins, right? Do you already have other 4-pin PWM type fans connected to mobo headers and running under proper control? Then the easy solution is called a Splitter, and it lets you connect two fans to one header. So if you have headers and fans, post back here for clear ideas on how to use a Splitter for your issue. Even if you cannot get a Splitter, I can tell you how to splice wires from the new fan onto ones from existing fans of the same design.