Make your overclocking increments small. In my case my multiplier was locked and all I could do was raise the FSB. So I would just raise the FSB up one then start up my computer, restart, raise it one more, and just keep going by one until you find the point where the computer isn't stable anymore. But I'm fairly new myself so thats just basics. Hopefully someone who really knows all about OC can give you more info =)