Can't control my case fans

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Senotajs

Reputable
Jan 22, 2015
13
0
4,510
A little while ago I bought a new case and a new motherboard. (BitFenix Neos Window and Gigabyte 990FXA-UD3). Two case fans came together with the case, both of them are 3pin and 12V if i'm not mistaken. One front fan and one rear fan. Rear fan is connected in sys_fan2 which is a 3 pin connector and front fan is connected in sys_fan1 which is a 4 pin connector. Last week I bought BetFenix Spectre LED PWM fan and I installed it in PWR connector which has 3pin connector, the fan itself has 4pin connector.

The problem is that my fans always run at full speed, two of the fans run at 1300RPM and the newest one runs at 1700RPM. They make too much noise, even with my headset on I can hear the fans. Is there a way of setting all 3 fans at speed of 700-1000RPM? I tried speedfan software but I could not make any fans change the speed, a part from CPU fan. I also tried to set fan speed in BIOS but nothing worked.

Here is the picture of current bios settings. I had speed control set to manual and changed the values but the fan speed stayed same.
http://i.imgur.com/bD9Jg7G.jpg
 
Solution
That four pin PWM header does not support 3 pin voltage control operation and the pwr-fan connector is a full time, full speed connection that cannot be controlled. If you want to be able to control the fan speed for all your case fans, then I'd suggest you use the four pin PWM fan header for your four pin PWM fan and get a splitter to use the sys_fan 2 voltage controlled header. Do not use the pwr fan header unless you want the fan running full speed.

https://www.amazon.com/Splitter-Extension-Sleeving-Connectors-Length/dp/B00C46DX4S



Or get something like the Grid+ v2 that allows you to connect both voltage and pwm controlled fans, and create precise profiles for each fan or run them all off the same profile...
Ohh, ok.I appreciate your support and attention. Thank you for helping me out and letting me understand more about fans and motherboard fan headers. I will get Noctua fan soon as possible. :)