Hi, as some of yall prolly know already I just got a new computer with a 754-pin) AMD ATHLON64 3000+ CPU. I dont know to much about hardware so i was just wondering what is normal temps for it to be running? My computer has a tempature gauge that i can look at and i have seen it go anywhere from 70 F to 85 F what is the "critical" tempature? also one more thing... There is a knob on the outside of my case that lets me control the speed of my fan should i have it turned all the way up ( fastest speed) or all the way down ( regular or slow speed) ? thanx in advance.