Z68AP-D3 PWM Bios settings

[superleeds27]

Been trying to work out whats the settings actually mean! Im wondering what would be best for my setup. Hoping to achieve as little noise as possible.

I believe the CPU Fan on the Arctic freezer 13 is whats causing the most noise in my case now!

Heres the settings in the bios

CPU Smart FAN Control
  Allows you to determine whether to enable the CPU fan speed control function and adjust the fan speed.

Normal - Allows the CPU fan to run at different speeds according to the CPU temperature. You can adjust the fan speed with EasyTune based on your system requirements. (Default)

Silent - Allows the CPU fan to run at slow speeds.
Manual - Allows you to control the CPU fan speed under the  Slope PWM item.
Disabled  Allows the CPU fan to run at full speeds.

Slope PWM
Allows you to control the CPU fan speed. This item is configurable only when CPU Smart FAN Control is set to Manual . Options are: 0.75 PWM value /oC
~ 2.50 PWM value /oC

CPU Smart FAN Mode
Specifies	how to control CPU fan speed. This item is configurable only when CPU Smart FAN Control is enabled. 

Auto - Lets the BIOS automatically detect the type of CPU fan installed and sets the optimal CPU fan control mode. (Default)

Voltage - Sets Voltage mode for a 3-pin CPU fan.
PWM  - Sets PWM mode for a 4-pin CPU fan.
  
Note: The  Voltage  mode can be set for a 3-pin CPU fan or a 4-pin CPU fan. However, for a 4-pin CPU fan that is not designed following Intel PWM fan	 specifications, selecting PWM mode may not effectively reduce the fan speed.

Any ideas guys, as to what would be best to keep the PC quiet. My fan speed always seems to be around 1100-1200RPM, even when the cpu is at 29C idle!