After reading around, you don't really want to be running too much over 40c. So I have my failsafe profile in setcpu set to go to 550mhrz at 45c. But I just loaded up the adamK low voltage kernel and I have yet to see it even reach 40c.
your not going to overheat either one... stop worrying and use your phone... this has been ranted over and over again... search is your friend too.... many thread on this already.