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Need Help with Fan Speed

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New Member
Mar 20, 2017
I bought a computer 2 years ago and never used it because it was to load. So I bought a new case and noticed that the Motherboard I have are 4 pin pwr while all of the fans are 3 pin power.

So someone please help me understand how this works and how to fix this.

My cpu coller is 4 pin and I can control that but not the 3 pins is there an adapter
Line up the tab on the motherboard with the groove one the fan connector. 3pin fans will work on 4pin headers and 4 pin fans will work on 3 pin headers. If you hook a PWM fan (4 pin) to a 3 pin header you wont be able to control the speed of the fan but it will run at full speed all the time. Good luck :)

Edit: I see from your title you might want to control the fan speed. In that case there are a couple options. There is something cakked the 7v mod which will lower the max speed of your fans by switching a couple fab wires. You can also purchase a low noise adapter. It is basically a fan extension cord with an inline resistor that causes your fan to get less voltage/turn slower. Or you can get PWM fans, but that's no fun :)
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I thought about that but seems like all the fans that I want are 3 pin (Corsair SP Series, SP120 RGB) I am stuck with this motherboard because I have 6 core LGA2011 socket type loaded with 64 gig of DDR3 (DAM)

Wish I knew detail before I bought this computer.
Note. I am not a gamer this is stickly for work I use VMs

Does anybody know about this case Phanteks Eclipse P400S and controlling fans
A drive bay fan controller is the best option. The in-line resistor solution is not adjustable and in my experience they often don't last long and you are back to full speed and noise.