Your machine signature says you are running 225FSB, but you stated 250FSB, which is it? In any case, it is already overclocked.
I have posted the score of the highest person to score a 17008 in 3Dmark2001 with default settings. I would like to mention though that of the people in that list, about 500 people scored higher all the way up to 23524 with varrying scores. Assuming you do not have FSAA enabled and are running the 3Dmark runs with everything set to default I would think you would be able to do much better. I score 14467 with a GF4 Ti4200 mildly overclocked. I could kick some @ss with a 9700 Pro...
Score: 17008 Hornet
Date: 2002-12-9
Res: 1024x768 32bit
OS: Microsoft Windows XP
CPU: Intel Pentium 4 3335 MHz
GPU: ATI RADEON 9700