2.7 GHz better battery life than 2.9 GHz?

[macbook123]

Say I do the exact same amount of computations. Obviously the 2.9 GHz will get them done 7% or so faster but will it also use more battery in the process?

 

[garyleecn]

I don't know for sure, but I think even if there is any difference, it will be marginal.

2.9g consumes more power, but runs shorter before returning to idle....

 

[powertoold]

No, same battery life

 

[fs454]

Same battery life 100%. The CPUs both run at extremely varying frequencies from 800mhz to 2.9ghz and up to their boost clock depending on the load. For battery-light tasks both CPUs are likely at very similar frequencies. Same applies for Pro 450/455/460. Identical battery life.