The 1.6 gig P4 is a little slow to get best scores with a 9700 pro.
Check stuff like anisotropic off, and no anti aliasing to get the max scores. CHeck your properties, settings, advanced, 9700 pro
and set performance to max.
The 1.6 P4 could be costing you 20-25% on your score. Those high benchmarks are run with amd 2700 or P4 3 gig systems. the proc speed makes a diffference.