I had one of those cards worked ok in Tiger now I have ATI sapphire radeon pro AGP 2400 and it works ok on my sys iDeneb 10.5.6 with voodoo kernel 9.6

AMD 3200+
MS1 6741 MB
Radeon Sapphire HD2400 pro AGP
Heres the link for that card above much better I think than going through all those endless experiments its not all that expensive $50 thereabouts going soon as the AGP cards are passing into history

http://www.mediafire.com/?n2xjzymm4wt