I didn't see anything about the 9600 being on AGP in that link. I would be surprised, I don't think any of the 8xxx cards are on AGP either, except maybe an 8500 or 8400... ATI seems to be the only company keeping AGP alive with the 2600 and 3850 cards on AGP.
To the OP, you are thinking about the 9600 PRO or XT, not GT. Leadtek, along with a ton of other manufactures, made them. Decent cards in their day.