I have a asus radeon ax800xl 256mb pic-E. It used to work fine but a now it won't slow it's fan lower than 3200rpm. I use ATI tray tool to control the fan speed, I also tried asus smartdoctor but it does the same thing. The card idles at about 45 celcius. I use to run it at 2300rpm and the noise is really irritating. Any help?