the sensors are wrong, the readings are backwards. the 30-40*c are your cpu temps and the 31*c is your case temp. Your cpu cannot be cooler than the air around it if you use a fan to cool. may be with a water cooled system.
the system temp sensors missreading is a conmmon problem with athlon xp chips
the system temp sensors missreading is a conmmon problem with athlon xp chips