Re:R300 path (Score 5, Informative)

ATI doesn't have any proprietary extensions for exposing the R300 shader functionality, only "ARB2" (ARB_vertex_program and ARB_fragment_program) so there's no way to do "specific" R300 path.

The leaked alpha does support ATI's two-sided stencil extension (ATI_separate_stencil) which is only implemented on R300.