Overdrive is disabled for cards that dont have a temperature sensor. My guess would be the driver/CP is not identifying the card properly and/or not picking up the sensor.
I'd say either wait for a hotfix or use ATI Tray Tools for the time being (if that still exists
).
Might wanna keep an eye on what the fan does during gaming. If the software is indeed not picking up on the sensor, it's possible the fan will not be controlled either. You'd get the same situation as with a recent Nvidia driver that ended up damaging cards because of it.
