Your Pentium 4 CPU is killing you. In one of my old systems, I had the same CPU and an 8500GT. I swapped out the 8500GT for a 9600GT, no difference in performance.
Get a new MOBO/CPU if you can. A cheap socket 775 MOBO (EVGA 730i) and a cheap Intel dual core processor (Intel Pentium D E5200 + overclock) would help a lot.
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