No.
First of all, you have to buy a Mac-specific video card. And currently, there is no Radeon 9600 being sold for your computer. If you want to buy something brand new, you can either get a Radeon 9000 or a Radeon 9800. You can also look to eBay for one - there are plenty of Radeon 8500s and GeForce 3s there, all of which should work in your computer. There's also a Mac version of the Radeon 9600 that can be modified to work in your computer.
Try doing a search of the forums also as there's a thread like this at least once a week.
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