Based on the clock premise for life, the 125mhz less for idle will help to offset the life span- assuming operational ceiling is not compromised (> 1ghz?). I use my N900 about three hours a day, but it is idle for the rest of the time. Since most of the day I am 125mhz less than the stock clock, this should (to some degree) offset the 800mhz factor that would not even be all of the three hours I use it).