Hi, If there is no correlation found, you may try chaning the base PWM frequency. I dont recall if the driver supports it (imho w83627th F ?) But if it is not "deluxe" board, Asus will ommit the PWM transitor and few other components. Yes they did it to me too - suckers. I have build my own regulator with some linear voltage regulator. I'm leaving for a holiday so perhaps someone else will answer ;) Rudolf