Hmm, strange. I wonder what makes them think it's a X1800 series card? I did have a X1800XT before but I uninstalled the drivers and ran Driver Cleaner before upgrading. The drivers that came with card work normally.
W1zzard, did Catalyst 8.6 work for you right out of the box? When I'm trying to use them with my Asus EAH4850, 3dMark + games thinks it a X1800 series card (with the performance of HD4850). Vista and CCC reports it correctly though.