just installed the radeon 64ddr vivo,i'm not getting great performance. i'm getting jerky 3d performance¬ so high fps.i've installed the latest 4in1 driver as well.does any one know the fix for this prob? here's my system spec's. amd athlon t bird 1 gig. asus a7 pro. 512megs pc 133 30gig quantum fb. sb live win98 se. thank you for any help you can give. 