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iMac hotter under 9
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Addicted to MacNN
Join Date: Dec 1999
Location: Pleasanton, CA
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I'm almost positive; I think my iMac runs much hotter under OS 9. I remember reading that the PowerBook G4 runs hotter under OS 9 because it can't idle the processor.
The variable-speed fan in the iMac is blasting in 9 compared to the nearly-silent spinning of the fan blades under X.
Does anybody else notice this? Does anybody know if it's the same problem the G4 PowerBooks have with 9?
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Junior Member
Join Date: Oct 1999
Location: Stockholm, Sweden
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It's obviously designed for OS X and not for 9. Not very surprising, but your observations are interesting nonetheless.
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Senior User
Join Date: Dec 2001
Location: Toronto, ON
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Funny, my G4 cube is hotter in OSX. I assume it is because OSX uses AltaVec for the GUI when OS9 rarely uses it.
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Iguana: The other green meat.
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Mac Elite
Join Date: Oct 2001
Location: Enschede
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i have found a slight difference in temperature too, on my imac 500mhz early 2001
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iMac G5 2.0 Ghz 20", 2 GB RAM, 400 GB, OS X 10.4.5, iPod with color screen 60 GB
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Professional Poster
Join Date: May 2001
Location: North Dakota, USA
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Interesting. My iBook 500 runs much hotter in OS X than 9, but only because the hard drive never spins down. If it would, I think the battery would last much better in X than 9 - but until Apple can figure out a way to get the UNIX system to stop paging, I don't know if X will be a great travel OS...
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
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seanyepez wrote:
I remember reading that the PowerBook G4 runs hotter under OS 9 because it can't idle the processor.
That's very strange. OS 9 definitely does allow for processor cycling, whereas OS X doesn't, AFAIK. OS X constantly accesses the drive for VM. It also depletes my battery in sleep (iBook 466) much faster than OS 9 sleep.
[ 02-28-2002: Message edited by: Big Mac ]
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Addicted to MacNN
Join Date: Dec 1999
Location: Pleasanton, CA
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Yes. It will deplete your battery faster. That's because it's more intense processing when it's actually being used (OS X). It has to calculate the GUI among other things.
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