I have 3 case fans in my phanteks p400s case. two of which come with the case and are from phanteks. the other fan is from my old rosewill case. the exhaust fan (phanteks) is connected to my motherboard (Asus H81m-a). the phanteks intake fan is connected directly through the case. the case is powered through a 12v connector. and the rosewill fan is connected through molex because my motherboard only has one fan header since it is cheap and micro atx. My problem is that no matter what temperature my pc is at, on load, or at idle, the fan speeds stay the same. The reason why i care is because the computer should be almost silent on idle, and it sounds the same as it does in load. If you have any questions about my other hardware, just ask.
chassis fans not adjusting speed according to temperatue
- Thread starter Ethan_21
- Start date
Yes, you need to be using 4-pin fans in all case ventilation locations. The only SYS_FAN header on your mobo is a 4-pin one using PWM Mode according to your mobo's manual, so it can only control 4-pin fans.
To connect three fans to a single SYS_FAN header you need a 4-pin fan splitter with three output legs like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812423162&cm_re=fan_splitter-_-12-423-162-_-Product
Note that a single fan header on a mobo can only handle speed pulse signals coming in from ONE fan. So of the splitter's three output legs, only one will have all four pins in it - the other two will be missing Pin #3. The only fan whose speed will be reported to the mobo for display will be the one plugged into the output with all 4 pins. BUT with your three fans plugged into this splitter and it plugged into your mobo SYS_FAN header, all of those fans will be under automatic control governed by the temperature of the mobo.
To connect three fans to a single SYS_FAN header you need a 4-pin fan splitter with three output legs like this:
http://www.newegg.com/Product/Product.aspx?Item=N82E16812423162&cm_re=fan_splitter-_-12-423-162-_-Product
Note that a single fan header on a mobo can only handle speed pulse signals coming in from ONE fan. So of the splitter's three output legs, only one will have all four pins in it - the other two will be missing Pin #3. The only fan whose speed will be reported to the mobo for display will be the one plugged into the output with all 4 pins. BUT with your three fans plugged into this splitter and it plugged into your mobo SYS_FAN header, all of those fans will be under automatic control governed by the temperature of the mobo.
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