I did't find the Firestream GPU in the support list of SDK1.4 from thread ATI Stream SDK v1.4-beta is now available!
But I found it in the document of SDK1.4!
Does SDK1.4 support Firestream GPU?
Or we have to wait for the newer drvier?
Please use Catalyst 9.3 for FireStream.
Please note that if you are using XP, then you should either use 9.2 (for Radeons) or wait for 9.3 Hotfix (for FireStream) that is coming out soon.