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Old Jul 24, 2011, 05:31 AM   #1
sdugoten
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Macbook air 2011 CPU throttle with no AC power?

Does anyone know if the Macbook air is not plug into power socket for power, does the CPU throttle the speed?

Thanks.

Last edited by sdugoten; Jul 24, 2011 at 10:20 AM.
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Old Jul 24, 2011, 09:42 AM   #2
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I don't think apple made the Macbook Air in 2001
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Old Jul 24, 2011, 10:20 AM   #3
sdugoten
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I don't think apple made the Macbook Air in 2001
Ha, typo.
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Old Jul 24, 2011, 10:28 AM   #4
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I don't think it will. It -- AFAIK -- throttles CPU speed/voltage based on load, not power profile. If you give it a full load on battery power, it will work as hard as it can to finish that workload (which may actually save battery -- 1 minute at full speed and 1 minute at idle speed may well be more efficient than 2 minutes at 50% speed).

What's important is throttling the voltage, not the speed.

We need the Coolbook developer to update his software, really.
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Old Jul 24, 2011, 10:32 AM   #5
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As above it does it all the time not just on battery!
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Old Jul 24, 2011, 10:38 AM   #6
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Quote:
Originally Posted by jdavtz View Post
I don't think it will. It -- AFAIK -- throttles CPU speed/voltage based on load, not power profile. If you give it a full load on battery power, it will work as hard as it can to finish that workload (which may actually save battery -- 1 minute at full speed and 1 minute at idle speed may well be more efficient than 2 minutes at 50% speed).

What's important is throttling the voltage, not the speed.

We need the Coolbook developer to update his software, really.
The developer needs to update it on two fronts.

1) Doesn't work on i5/i7
2) Doesn't work on Lion

I've got a 2010 MBA and have been using cookbook until it promptly stopped working when I upgraded to Lion. Rumor out there is that there will be an update and will cost $5 for existing users. I emailed the developer several days ago but have not received a reply.
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Old Aug 22, 2011, 10:29 PM   #7
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Thanks for the info. Bit surprised there is no inbuilt Mac OS X way of throttling the CPU down to lengthen battery life especially if doing very low intensity tasks like taking notes in class (i.e. word processing). I remember in older Macbooks at least, there was an option to click on Power and set to better performance or better battery which was probably CPU throttling?
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Old Aug 22, 2011, 11:52 PM   #8
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Originally Posted by jace88 View Post
Thanks for the info. Bit surprised there is no inbuilt Mac OS X way of throttling the CPU down to lengthen battery life especially if doing very low intensity tasks like taking notes in class (i.e. word processing). I remember in older Macbooks at least, there was an option to click on Power and set to better performance or better battery which was probably CPU throttling?
The CPU does throttle both in voltage and clock sped on it's own. Coolbook takes an additional step and allows user selected settings that lowers the voltage even below what Intel specifies. Apple isn't going to allow you to run the CPU out of spec (nor should they) which is what cookbook is essentially allowing you to do.
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