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[Bearded001]

So I have an x58 pro-e motherboard and I installed a Coolermaster V6 GT air CPU cooler. The problem I'm having is that I can't adjust the fan speeds of the cooler using the BIOS. The cooler uses PWM fans and there seems no option to change cpu fan speed in the BIOS. The fans are stuck at running at 100% which is quite loud and unnecessary. I've tried using SpeedFan and other software programs to change the fan speed but to no avail. My friend has a Gigabyte motherboard with a Phoenix BIOS and the fan controls let him change from voltage to PWM is there no similar option with the X85 Pro-e BIOS??

[Ex Forum Mod]

 Do you mean X58 Pro-E not X85?

[Bearded001]

So sorry, horrible mistype.. Yes, the X58 Pro-e 

[Froggy Gremlin]

Nothing in the BIOS 'Hardware' or similar section about fan control? If not, only solution may be with an aftermarket fan controller.

[Bearded001]

The H/W section in the BIOS only lets me set smartfan temperatures or disable the function. The minimum temperature is 40C but my CPU is at 19C and fan speed is still at 100% as default. Any idea why a software utility like speedfan won't work?

[Bernhard]

Normally the BIOS allows you to set the target temp, i.e. 40C. This means the fan should run at the percentage set until your CPU gets to 40C. Once it goes beyond 40C, the fan will spool up above the percentage speed you set. Thispercentage fan speed setting will only becomes visible when you set a target temp i.e. you go to manually setting the fan behaviour.
As for Speedfan, it can only control fans that are controlled by Fintek chips that have been programmed into the Speedfan code. Speedfan is developed by an individual and he can't keep up programming all possible chips in the market. He usually tests the most popular boards and expects feedback from users like you. You will see in Speedfan how to compile a dump file and then send it to the developer. If he gets the time, he may analyse it and try to help you.
There is that remote possibility that your board has a faulty PWM control circuit/chip or even the PWM control circuit of your cooling fan itself. You would need to test the fan on another board to see if it works or not. If it does, then you know where to start investigating next.