Support is either there or it isn't. As of today, an FX5200 (a terrible card fwiw) is fully supported, whereas its counterpart, the Radeon 9000 (a much better alternative) just received HyperZ support. Of course, the Radeon 9000 has been supported in the binary drivers before, but how long has it been since support has been dropped there?
No announcement yet.
Radeon HyperZ R300g Performance