When I play wow(haven't tried other games yet) the screen sometimes freezes. This usually happens after an hour or so. Either I have to wait 15mins for ccc to give me a "Sorry we crashed" message, or I must reboot. Why does this happen? I have updated to the latest 10.3 drivers.
I think your graphic card could be either broken or overheated.
BTW : Powercolor is never on the my shoping list. Powercolor is cheap and has cheap quality as well. (No offence but that is just my opinion.) I always try to aim brands like Gigabyte, MSI, ASUS, HIS, eVGA, XFX, or Sapphire.