MSI Afterburner not detecting my fan on radeon hd 4870x2

Hi,

I was wondering if anyone can help? I have just downloaded and installed msi afterburner from their official website; however, when I launch the msi control panel it is not detecting that I have a fan. The other settings are all there just not the fan settings. The settings and auto buttons are grey and when I click onto the settings screen and select fan it allows me to enable user defined software automatic fan control and adjust the settings, but after pressing ok none of the settings take effect and the fan speed auto and settings buttons remain greyed out. I am not able to adjust the fan at all -- it's as if it's not there. My GPU is a Radeon HD 4870x2 and I am able to adjust all of the fan settings in my ATI catalyst control centre so I know it's there and working properly, but MSI just wont detect it. Anyone got any ideas as to what could be the cause?