I have amd athlon(tm) 64 processor 3800+, nvidia gforce 9500 ct 1gb graphic card, creative sb x-fi sound card, 3gb ram 2.41 ghz. On a ecs elitegroup n force 4m-a v3.0 motherboard. 500w power supply running 2002 xp 2. I want to upgrade processor to the best amd am2 socket and also want to know if I am currantly under powered. Any help will be appriciated. Lamen's terms please.