01/24/2011, 11:23 AM
Well, as I told you via mail already:
Setting clock rates of 250MHz or 125MHz won't result in higher cpu usage and energy consumation, that's just a simplified description. The point is, that all processes which run in the background (and there are many) are timed according to the standard clock rate of 500MHz. Using higher rates won't do any conflicts, but setting it to lower, for example time can behave very strangely, because it is "counted" with the normal cpu clock, because the Pre doesn't have a time chip.
Using lower clock rates won't directly result in higher cpu load or energy consumation, but there could occur other problems with system processes, while having a very small difference in energy savage. Therefore I recommend using 500MHz as a minimum. Of course, everybody is free to choose a lower clockrate and will, in most cases, not run into any problems with that decission.