Flandry, you can not argue against real science and you type the truth. a key point:

"So while there is a linear scaling for temperature within a given range of frequencies, there's an exponential decline in lifetime."

That is my point from another perspective of it (in regards to a result) The point for which the temps spike significantly (five to ten degrees), is the operational ceiling and also the point for exponential / accelerated lifespan decline.

We are speaking the same thing, I am just trying to "hillbilly" it down a notch I am a hillbilly BTW

Added:

I do not think the N900 will have a profound lifespan issue at 800mhz as a max clock- based on Droid testing and me not noticing a temp increase or additional battery drain (compared to 600mhz). My guess is the 125mhz min is offsetting the battery, since my device spends more time idle than active.