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Leopard optimization or a big bug?
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Professional Poster
Join Date: Nov 2004
Location: eating kernel
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I have noticed that after I upgraded Leopard on my iMac (C2D, 2.16 GHz, 64-bit , last of the white iMacs) the fans almost never spin up. Even when encoding video (ranges from 50-90% CPU) the fans barely spin up at all. The only thing I can think of is that a) Its optimizations in Leopard, b) the 64-bit OS, and c) its a major bug that puts me at risk of a CPU over heat. I have tested video encoding on my MacBook (1st gen Core Duo, 2.0 GHz) and the fans go full blast when encoding (at it takes a long time).
Question: if I'm not mistaken, was Tiger a 32-bit only OS?
Can anyone with a Core Duo running Leopard test this to see if your fans go full blast? And can other C2D iMac owners test this to see if the fans spin up?
Thanks 
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Clinically Insane
Join Date: Oct 2000
Location: Los Angeles
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It's has nothing to do with 32 versus 64-bit, for one. I don't think it's anything to worry about, for two. YMMV.
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"The natural progress of things is for liberty to yield and government to gain ground." TJ
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Posting Junkie
Join Date: Feb 2005
Location: 888500128
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50%-90% really isn't that much, even over a prolonged period of time.
Remember, the dual-processor machines go to 200%.
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Moderator  Join Date: Jan 2001
Location: Polwaristan
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my C2D MBP 2GB RAM is quieter as well after going to Leopard.
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Posting Junkie
Join Date: Oct 2005
Location: Houston, TX
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What's your CPU temperature?
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Professional Poster
Join Date: Nov 2004
Location: eating kernel
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Originally Posted by mduell 
What's your CPU temperature?
105 F (when idle)
130 F (during video encoding)
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Last edited by C.A.T.S. CEO; Nov 3, 2007 at 01:03 PM.
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Posting Junkie
Join Date: Nov 2000
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Originally Posted by C.A.T.S. CEO
105 F (when idle)
130 F (during video encoding)
Bingo. 130F is very moderate. There's no need for extra fan noise if your iMac's CPU is at 130F. Get it up to 150F and you'll hear something.
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