Annoying noise from rear fan.

[NovaShock]

Hello. I have a rear fan connected to 'SYS_FAN1' but I can not control its speed. In the BIOS (Gigabyte EP41-UD3L) I can only monitor the data. Finally, I tried a program called 'Speedfan' but the fan is located in the program with the name 'Fan 4' which do not see the option to control this.
However I have also connected to a front fan 'SYS_FAN2' and this does work.

The fan is rotating at 3054 rpm and In the spec say W/RPM adjustement 1100-2800 RPM, I just want it down a bit so that my ears do not break 😉 Any idea? maybe you can help me..

Thanks!

 

[Fullmetalalkami]

SYS_FAN will make it run at its highest RPM, swap the fan into a CPU_FAN or CHAS_FAN

 

[Fullmetalalkami]

And then you should be able to change the fan speeds in bios coz 3000rpm must be like a small jet taking off

 

[NovaShock]

SYS_FAN will make it run at its highest RPM, swap the fan into a CPU_FAN or CHAS_FAN

CPU_FAN is occupied by the cpu fan. My motherboard lacks CHAS_Fan. I have only one free 'PWR_FAN, will it work on this?
Thanks for the quick answer

 

[nukemaster]

Unfortunatly your manual indicates that SYS_FAN1/PWR_FAN do NOT control speeds. Without the hardware to do it, software will not help.

If your fans are not overly power hungry, You may be able to use a Y cable to run the front and back fans off the SYS_FAN2 header that does control fan speeds.

Another option is to buy a fan controller to reduce the voltage of the fan or even try to run it on 5 volts(you can build or buy an adapter to do this). If you do go the 5 volt path, I recommend making a front fan 5 and letting the board control the rear can because most of the heat is closer to that fan.

If 5 volts is too slow, they also sell inline adapters to slow a fan down by placing a 20-50 ohm resistor in the loop(eating extra voltage[this makes heat so make sure the adapter is rated for the fan current] and thus slowing the fan down).