I got a higher score in 3dmarks 2001 with my old OCed Gf3Ti200 then my Fx5200U OCed. The oc on the Fx card didnt do much at all even though it oced alot
but overall the Fx card did perform better in games actually.
You can use Riva tuner to see if it is 64 or 128bit, you get it from www.guru3d.com
Check the main window where the Gpu name and ram info is showed.