Confirmed that the CPU governor “powersave” works, the temperature stay constant at 54 C :
sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +54.0°C (crit = +105.0°C)
temp2: +54.0°C (crit = +105.0°C)
And I have set in AMI BIOS for the fan to drop to 50% speed if temperature is less than 55%
However, the fan is still going full blast 
Ideas ?
cheers, HS