AMD Catalyst 13.4 WHQL drivers have been released. I know they have been in beta for several months and support a number of the OpenGL 4.3 features.http://support.amd.com/us/kbarticles/Pages/AMDCatalyst13-4WINReleaseNotes.aspx
I don't know which features you require but a quick copy and paste from the notes revealed the following:
- Delivers support for the following OpenGL 4.3 features:
- GL_ARB_compute_shader
- GL_ARB_multi_draw_indirect
- GL_ARB_shader_storage_buffer_object
- GL_ARB_arrays_of_arrays
- GL_ARB_clear_buffer_object
- GL_ARB_ES3_compatibility
- GL_ARB_explicit_uniform_location
- GL_ARB_fragment_layer_viewport
- GL_ARB_invalidate_subdata
- GL_ARB_program_interface_query
- GL_ARB_shader_image_size
- GL_ARB_stencil_texturing
- GL_ARB_texture_buffer_range
- GL_ARB_texture_query_levels
- GL_ARB_texture_storage_multisample
For reference, the entire release notes are here: http://support.amd.com/us/kbarticles/Pages/AMDCatalyst13-4WINReleaseNotes.aspx