I have a Gigabyte 8600GT 256MB in one computer - the only installer that worked for that card was johnniecarcinogen's v0.1 installer (drivers at insanelymac.com) I also have a Gigabyte 8600GTS 256MB in another - the only thing that worked for that was using Zephy's ORIGINAL "Universal Installer" AND applying the 10.5.1 AMD Updates. Unless you know how to fix the .kexts yourself, sometimes it takes quite a bit of effort to find a package or installer that works properly...

I wouldn't use 10.5.2 Software Update - that'll probably break everything... (At least until you have a patched/hacked for AMD version)

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...