If you are looking for the latest Catalyst drivers (official) for Windows 8, check this out.
On November 25th, AMD released official preview drivers that support the AMD cards Radeon HD 6000 and HD 5000. Yes, all cards like 5400, 5600, 5700, 5800, 5900 work.
The drivers still has issues and is only intended as a preview drivers. We have prepared a download page for the latest video card drivers for Windows 8 that you can view and bookmark here:
We’ll be updating the site when the official NVIDIA drivers comes out and when AMD releases drivers for other AMD/ATI cards.
On forums, you will find many preview builds and self-made drivers that can possibly support