There is clearly something wrong with the 64bit drivers, as a few days ago i tested the card under xp and vista under 32bit and the card works fine.
The only way the card works under windows 7 64bit is if i used my driver disk that came with the card witch has CCC 9.10 and drivers from 2009.
The last new drivers that i know of that did work was the 13.1 AMD Catalyst 13.1 Legacy Download
but you can't get thous anywhere.
I used DDU but nothing changed and the drivers from windows update witch are from 2011/12 also worked fine.
i would use the driver from windows update but i want to use the setting in Catalyst.