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#1 2011-07-16 11:09:25

Shark
Member
From: /dev/zero
Registered: 2011-02-28
Posts: 684

[SOLVED] One core hotter that the other

Hi

I have ASUS k50ij, Celeron(R) Dual-Core CPU T3000 @ 1.80GHz. I have  noticed that one core (Core 1) is always hotter than the other. Core 0 is always cooler. When idle:

acpitz-virtual-0
Adapter: Virtual device
temp1:        +45.0°C  (crit = +111.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +38.0°C  (high = +105.0°C, crit = +105.0°C)

coretemp-isa-0001
Adapter: ISA adapter
Core 1:       +42.0°C  (high = +105.0°C, crit = +105.0°C)
 

Usually, Core 1 is hotter for about 5-8°C. Is this normal? I have already cleaned the fans. As i remember thar wasn't the case, let's say, two months ago.

Last edited by Shark (2011-07-16 14:08:21)


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#2 2011-07-16 11:39:32

litemotiv
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Registered: 2008-08-01
Posts: 5,026

Re: [SOLVED] One core hotter that the other

Yes that's normal, the workload can never be completely equally divided over both cores. It's also possible that one core has a little bit more heat generation because of it's physical location in the chip, slightly uneven cooling paste distribution, or thermal influences from outside the chip (there's not much room for heat dissipation in a laptop).


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#3 2011-07-16 11:54:41

Shark
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From: /dev/zero
Registered: 2011-02-28
Posts: 684

Re: [SOLVED] One core hotter that the other

Ok. Thanks for the answer. I am asking the question because two months ago temperature for cores were different and almost identical. Should be summer season guilty for this?  smile


If you have built castles in the air, your work need not be lost; that is where they should be. Now put foundations under them.
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#4 2011-07-16 13:33:21

graysky
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From: :wq
Registered: 2008-12-01
Posts: 10,595
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Re: [SOLVED] One core hotter that the other

litemotiv wrote:

It's also possible that one core has a little bit more heat generation because of it's physical location in the chip, slightly uneven cooling paste distribution, or thermal influences from outside the chip (there's not much room for heat dissipation in a laptop).

+1 for this statement.  Another factor is the "flatness" of the die and the "flatness" of the HSF.  This is evidence when the CPU and the HS have physically ground down to a flat surface.  For example for CPU and for heatsinks. ...I wouldn't worry about it if I were you.

Last edited by graysky (2011-07-16 13:35:15)


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#5 2011-07-16 13:51:59

Shark
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From: /dev/zero
Registered: 2011-02-28
Posts: 684

Re: [SOLVED] One core hotter that the other

Thanks for info graysky. I learned something today.

Tough it is interesting that when i do htop, for example, i can see that core number 1 is a lot more under work than core two, but lm_sensors tell me that core 0 is cooler than core 1. Is it maybe that core 0 is core number 1 in htop?


If you have built castles in the air, your work need not be lost; that is where they should be. Now put foundations under them.
Henry David Thoreau

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#6 2011-07-16 13:56:12

graysky
Wiki Maintainer
From: :wq
Registered: 2008-12-01
Posts: 10,595
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Re: [SOLVED] One core hotter that the other

Shark wrote:

Thanks for info graysky. I learned something today.

Tough it is interesting that when i do htop, for example, i can see that core number 1 is a lot more under work than core two, but lm_sensors tell me that core 0 is cooler than core 1. Is it maybe that core 0 is core number 1 in htop?

Doubt it... again, if it's a physical cause, the work load may not be relevant.


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#7 2011-07-16 14:04:48

student975
Member
From: Russian Federation
Registered: 2011-03-05
Posts: 613

Re: [SOLVED] One core hotter that the other

I have the same situation for Celeron E3200 2.40GHz with two cores. 35C and 41C without any load and with very efficient cooler. My NAS with this CPU (and, of course, under Arch) is running 24/7 without any problems. So I share POV it is just normal legal technological difference.


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#8 2011-07-16 14:07:56

Shark
Member
From: /dev/zero
Registered: 2011-02-28
Posts: 684

Re: [SOLVED] One core hotter that the other

Ok. No worries than smile
Thank you guys.


If you have built castles in the air, your work need not be lost; that is where they should be. Now put foundations under them.
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#9 2011-07-16 14:10:00

Shark
Member
From: /dev/zero
Registered: 2011-02-28
Posts: 684

Re: [SOLVED] One core hotter that the other

@graysky

I have seen your links under your message about kernel26-ck. I think i will try it. I have always used generic kernels. Now it is time to try something else smile

Last edited by Shark (2011-07-16 14:33:54)


If you have built castles in the air, your work need not be lost; that is where they should be. Now put foundations under them.
Henry David Thoreau

Registered Linux User: #559057

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