Celeron P4500: 10*C difference between cores

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frr
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Celeron P4500: 10*C difference between cores

Post by frr »

Dear everyone,

I'm writing this just to report that a Celeron P4500 (mobile Arrandale Nehalem @ 1.86 GHz), that has just passed through my hands, reports different temperatures for its two cores (in Core Temp 1.0 RC2, downloaded recently). Namely, one core seems to show a constant offset of 10*C against the other.

I cannot really tell which core is right :-) When idle in XP/XPe, the lower figure is about 25*C, the higher figure is about 35*C - the ambient temperature in the room is about 21*C, the system is an overly ventilated MiniITX chassis (an ARK-6622 by Advantech with an AIMB-270 motherboard) and the CPU has a neatly thermocoupled (yet somewhat smallish) "active" heatsink, where "active" = with a fan on top, constantly at full RPM (no RPM steering).
In the Core Temp options, I've manually compensated the apparent offset by adding a +10*C offset for one of the cores = I chose the higher temp.value of the two, i.e. 35*C at idle, just to be on the safe side. Under full load (2 instances of Furmark), the reported temperatures settle at 55*C.

Although the linux-based coretemp.ko reports the cores as #0 and #2, they should be two perfectly identical cores of the dual-core Celeron CPU (rather than, say, the 32nm CPU die vs. the 45nm graphics die).

...now that I've documented the issue, I'd like to wish a beautiful day to all of you :-)

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The Coolest
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Re: Celeron P4500: 10*C difference between cores

Post by The Coolest »

Thanks, it seems that not all sensors are made equal.
These are cheap CPUs, maybe will a little bit lower QA requirements.
It's not uncommon to see ±5 difference in temperature between core temps. My 2600K gets about 5C difference at full load, with one core being noticeably "cooler".
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Core Temp - Accurate temperature monitor for Intel's Core/Core 2 and AMD64 processors

wootwoot55
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Re: Celeron P4500: 10*C difference between cores

Post by wootwoot55 »

On the topic of core temperatures i also have an i7 2600k and there seems to be a big difference in temperature between the asus AI Suite II and core temp like core temp will read 80 Celsius and the asus AI Suite II will read 53...which ones right? or more likely to be?

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