I have a 2.93Ghz core 2 duo iMac, and i was wondering does high CPU usage for long periods of time somehow damage it? I need to convert a lot of my large video file footage and sometimes it takes up to 18 hours at a time to covert, during that time CPU is at around 100% usage while temperature stays between 149-153F. So in a long run if i keep working my mac like that will it cut its life significantly or not?