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You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Notebooks > if the aluminum powerbooks processor isn't scalable...

if the aluminum powerbooks processor isn't scalable...
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wy4tt
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Mar 19, 2004, 10:29 AM
 
then what does it mean to set processor performance to highest? and if someone can answer this...how much difference in performance is there when energy settings are set to "longest battery life" as opposed to "highest performance"? i'm just curious. thanks for any info here.
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nate_02
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Mar 19, 2004, 10:55 AM
 
I can't answer the whole question but when using Final Cut Pro, when on "longest battery life," I have a lot of dropped frames and the whole program seems really slow. When on "highest performance" the program works just fine.
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Maflynn
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Mar 19, 2004, 11:11 AM
 
Originally posted by wy4tt:
then what does it mean to set processor performance to highest? and if someone can answer this...
I'm not quite sure what you mean that its not scalable, but when changing the setting within the energy settings, it either lowers the voltage on the cpu or lowers the stepping rate for the cpu. Either way the cpu executes instruction at a slower rate but prolongs battery life. I typically have it set to highest when plugged in the slowest setting when I'm not. I never use the automatic feature which doesn't equate to highest when plugged in.


Mike
     
wy4tt  (op)
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Mar 19, 2004, 12:07 PM
 
thanks. i thought i'd read somewhere that these processors' clock speeds are always the same, rather than being able to scale them down for greater battery life. maybe i was wrong?
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Luca Rescigno
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Mar 19, 2004, 12:37 PM
 
Yeah, you must have read incorrect information. All PowerBooks and iBooks will slow down their processors in order to increase battery life. Even my 233 MHz PowerBook G3 could do that.

"That's Mama Luigi to you, Mario!" *wheeze*
     
   
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