Download AMD Catalyst 13.11 BETA6 (13.250.18.0 October 24) Driver. This Beta driver works with Windows 7, 8 and 8.1.

We have a discussion thread open on this driver right here.

Feature Highlights of The AMD Catalyst 13.11 Beta6 Driver for Windows

• Includes all Feature Highlights of AMD Catalyst 13.11 Beta
• Includes support for the new products:
  • AMD Radeon™ R9 290X
  • AMD Radeon R9 290
• Performance improvements
  • Batman: Arkham Origins - improves performance up to 35% with MSAA 8x enabled
    
  • Total War™: Rome 2 - improves performance up to 10%
  • Battlefield 3 - improves performance up to 10%
  • GRID 2 - improves performance up to 8.5%
  • DiRT Showdown - improves performance up to 10%
  • Formula 1™ 2013 - improves performance up to 8%
  • DiRT 3 - improves performance up to 7%
  • Sleeping Dogs - improves performance up to 5%
• Automatic AMD Eyefinity Configuration;
• Automatic "plug and play" configuration of supported Ultra HD/4K tiled displays

Build Info:
DriverVer=10/24/2013, 13.250.18.0000
13.25.18-131024a-164159E-ATI
Catalyst: 13.11
CCC: 2013.1024.1808.30712
3D: 9.14.10.01001
OGL: 6.14.10.12614
OCL: 10.0.1348.4