They're both pretty bad for gaming. I wouldn't recommend anything below a geforce 3 or a Radeon 8500. Right now the best bang for the buck is a Geforce 4 ti 4200. If that's out of your price range then I recommend either a geforce 3 or a Radeon 8500. If those are out of your price range, then do not expect to be able to play many recent games.
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