Single Core vs. Dual Core - Temperature Differences

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Level 1

5 points

Single Core vs. Dual Core - Temperature Differences

Does anyone else notice that CPU temperature is affected by turning off one of the cores using the apple CHUD tools? For me, the extensions report that it's running 15-20C hotter when I'm running single core. The case temperature seems to confirm this fact as well. Can someone with CHUD installed please try to duplicate this?

I've got a stock 15.4" MBP 1.83GHz/512MB - W8613.

Macbook Pro Mac OS X (10.4.6)

Posted on May 12, 2006 2:18 PM

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Answer 1

Mark Hunt

Level 4

1,070 points

May 12, 2006 2:22 PM in response to bzurc

Mine gets hotter also, but not 15-20C hotter, maybe 7 C hotter...

(from around 86F normal operating, to around 100F when on one core.)

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Answer 2

bzurc Author

Level 1

5 points

May 12, 2006 2:25 PM in response to Mark Hunt

Woah, that's hot... I'm talking 45-55C with dual core to 60-70C with single core

Macbook Pro Mac OS X (10.4.6)

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Answer 3

Mark Hunt

Level 4

1,070 points

May 12, 2006 2:38 PM in response to bzurc

60 C = 140 F

Mine is cooler....??

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Answer 4

bzurc Author

Level 1

5 points

May 12, 2006 2:56 PM in response to Mark Hunt

Ahh.. sorry I notice now that your numbers are in Fahrenheit. I wonder how there can be such a temperature discrepancy with these things. You are referring to CPU temp, correct, not external case temp.

Macbook Pro Mac OS X (10.4.6)

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Answer 5

May 12, 2006 3:07 PM in response to bzurc

it also uses the battery more. I conjecture that disabling a processor also disables power management. This solves the hiss because the hiss is due to power management, but at the cost of more heat and battery usage.

I suggest using quietmbp rather than disabling a core.

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Answer 6

bzurc Author

Level 1

5 points

May 12, 2006 3:10 PM in response to Charles Hedrick1

Thanks Charles, that's good information. Can we also speculate that the extra heat is related to the power management as well?

Macbook Pro Mac OS X (10.4.6)

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