The Cat 3.6's work just fine on my crappy dualhead Radeon VR (7000) on my work rig.
The card is a "powered by" not a "built by". I _believe_ these drivers will work on all Radeon series cards now (except mobile chipsets)
Give it a try but I can't imagine it would be a problem. They also work on my Crucial Radeon 9700pro (Mackanz found me that magnificent bargain back in February!)