I use MSI Afterburner to control fan speed. I set 40% fan speed and I forget it, i playing GTA IV and the card is 99 celsius degree and the gpu fan speed automatic 100% speed. Why? At 100 degree celsius automatic full fan speed? But i set fix 40% fan speed in MSI Afterburner, then why load the fan speed 100% when it reaches 100 celsius? This is a safety function in MSI Afterburner?