I want to squeeze a little more life out of this system (and play Left 4 Dead), but there seems to be something wrong. The Barton core has a locked multiplier, so I have to just adjust the FSB. If I turn it up much at all, the computer will boot to windows, and after the initial loading screen it will reboot.
I have three 512mb memory sticks, one PC2700 and the others PC3200.
It could be overheating/not enough vCore etc. The stock cooler on those older Athlons manages to just keep them within specified temperature, I wouldn't try overclock on a stock cooler if I were you. If this isn't a stock cooler then it would have to do with voltage.