As mentioned you can overclock it a bit with that utility. It's also supposed to do AGP 2X, but mine defaults to 1X. You can force it to 2X through a registry hack, but that caused instability when I tried it on mine.
As for it not being a good card etc. it depends on what you are doing with it. Wizardry 8 just came out and it runs decent enough on the G200. Basically if you aren't going to do much 3D gaming or what 3D gaming you do isn't fast paced shooter games then it may still be fine for you.
-MO