Okay before you begin harping on riva tuner I have tried it but prefer CCC okay
Recently upgraded my install of CCC and diligently un-installed the previous drivers.
Two things ..
First the hardware is identified as a [H190L] in CCC but displayed properly as a HD4650 in device manager. Performance has been acceptable for now.
Second the 'ati overdrive' is no where to be seen.
I did a little web searching on the issue but found confusing conflicting information.