What system are you trying to run it on??

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An x86 Athlon ... *ahem* [:I] ]'>

[edited to add] Sorry, I probably should have specified that earlier. This seemed the nearest equivalent as these machines made common use of the card.

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You need to ask this question over at the OSX/86 project.

http://wiki.osx86project.org/wiki/index.php/Main_Page

What you also have to remember is that video cards need a Mac ROM to run on a Mac. I'm not sure MacOS on a generic PC is going to work properly with an added video card that has a PC ROM.