Your card is already a couple years old and doesn't appear on the Radeon HD 7xxx series lists, anymore, on AMD's current graphics card listings when you select drivers.
You might try working backwards through the previous Catalyst versions to see if one is old enough to support your card and new enough to support what Adobe's CC 2014 is asking it to do:
Previous AMD Catalyst™ Display Drivers
I'd try the 13.4 from May 2013, first, since that is about the time that PS CC came out.