Ok I am really new to this and plan to try to overclock my new p4 3.4 ghz. I have not yet picked out a mobo but I am leaning tward the Asus from what I have been reading. I want to know how you all can tell what temp your cpu is running. Is there a built in sensor or do you have to buy a temp monitor to tell. If a temp monitor is nessesay can you please point me in the direction of a good one.