AMD has released a new AMD Catalyst 13.11 Beta Driver for Windows
Feature Highlights of The AMD Catalyst 13.11 Beta Driver for WindowsAMD Catalyst 13.11 Beta Driver for Windows
Includes support for the new products:
AMD Radeon R9 280X
AMD Radeon R9 270X
AMD Radeon R7 260X
AMD Radeon R7 250
AMD Radeon R7 240