Originally Posted by Skullwipe
Right on, so just switch the CPU header to manual and voltage control and speedfan should allow me to dial in a nice curve? Going to have to check the length on the blocks 4 pin cable and see if I can reach sys_fan 2 or 3.
Do you mean switch from Auto or PWM to voltage control in the BIOS for the CPU fan control? You shouldn't do that if you have a PWM fan plugged into CPU_FAN. SpeedFan messages a percentage to the chip that controls stuff, but if that chip uses CPU_FAN in voltage control mode, the percentage controls the voltage. With voltage, a low percentage will shut the fan off or keep it from turning on. With PWM, 0 % will make the fan run on its lowest speed, so no mistakes are possible.
You can basically ignore the settings in the BIOS about manually setting the temperature to PWM curve. It only matters for booting. The moment SpeedFan is done loading, it will take over the signals you've told it to take over. If you don't know SpeedFan, you really have to read a guide with screenshots. There's no way to guess how to make it work. Before you've set it up, SpeedFan will only display RPM and temperature, the percentage controls will simply not work.