Availability of XO-1.5 ATest-2 machines

John Watlington wad at laptop.org
Mon Jul 20 10:28:14 EDT 2009

On Jul 20, 2009, at 12:37 AM, Richard A. Smith wrote:

> Carlos Nazareno wrote:
>> Also, what determines the dynamic clock rate from 400MHz to 1GHz? Is
>> this auto-scaling on demand like with the old AMD Athlon64's? Does  
>> the
>> software automatically reduce speed to 400MHz when the unit is
>> unplugged?
> Dyanamic clock scaling is usefully for thermal limits only.  Scaling
> back the clock to 400Mhz will cost you power not save it.  Power  
> savings
>   are achieved by running as fast as you possibly can and then  
> entering
> one of the lower power states where the clock is stopped.

Which is why the C7-M takes this farther, and enters C4 automatically,
where the external clock generator is told to stop driving the chip  
and the
processor core power is dropped to an absolute minimum.


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