The temperature sensor is at the Northbridge chipset, which is located below the CPU. I have an Antec P180 case and have tried to set the three fans (one at the back, one at the front intake and a third at the top of the case right above the CPU fan). I tried different speed combinations, but still can`t get the motherboard temp to be lower than 34degrees. The actual CPU core temperature is 3 degrees higher at 33 deg. The room ambient temperature is 22.