Gunthr with all that horsepower, why on earth are you still running AH at vga resolution?
800x600 is friggin lego!
3500 in 3dmark2001 is not bad or good, pretty average for your display card. If you'd have a geforce3 you could expect almost double that figure. Your display card is too slow compared to what your CPU could handle - that's your bottleneck.
I get 60-85 fps @5k over A1 mind, my system is 1.56 AMD, geforce2 MX 200, 384Mb DDR (KG7) raid 0, SB live, dx 8.1, det 12.41.
With my lowly mx200 my 3dmark2001 score is 2570 pts. I know, I'm REALLY display card limited =)