Why & Should CPU Core 2 be higher temp than Core 1 ?

AmigaOne X1000 platform specific issues.
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amigasociety
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Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by amigasociety »

Something that I just thought as normal for 2.5 years but now thinking it may not be, is my Core 2 has always been hotter than Core 1. Either from CFE or using X1KTemp docky, my Core 2 is always 2 degrees C hotter than Core 1.

Asking other X1K owners about their temps, they tell me their Core 2 is cooler.

So, do I have some fault here?

Not dust as I blew mine out and was not much there from the start anyway.

Plus it has been this way from day 1 and always hotter per the gauges.

Maybe thermal paste not done correctly at factory???

Just curious if I should worry about this as one day when that second Core starts to be used, will it overheat.

Thanks for any advice on this.

TJ

Right now my Core 1 is 55C and my Core 2 is 57C.
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by tonyw »

The temperature-measuring components inside the two cores consist of a thermistor (resistor that changes its resistance according to temperature). Its resistance is no more accurately determinable than any other resistor on the chip, hence is probably within a few per cent of its nominal value.

When you consider that the indications (55 and 57) have to be added to 273 to get their absolute values, then you are comparing (55+273=328) and 330 K. Hardly a significant difference (<1%).

I wouldn't worry about such a small difference. Now if it were 10 or 15 K, then there might be a question...
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by amigasociety »

tonyw wrote:The temperature-measuring components inside the two cores consist of a thermistor (resistor that changes its resistance according to temperature). Its resistance is no more accurately determinable than any other resistor on the chip, hence is probably within a few per cent of its nominal value.

When you consider that the indications (55 and 57) have to be added to 273 to get their absolute values, then you are comparing (55+273=328) and 330 K. Hardly a significant difference (<1%).

I wouldn't worry about such a small difference. Now if it were 10 or 15 K, then there might be a question...
Thanks Tony, appreciate the answer.

TJ
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by danbeaver »

I hate to add to the complexity of the issue, but thermistors actually "drift" with usage a few percentage points as the metals age, although this is usually within a defined percentage depending on the quality of their built staying (if all goes well) within 1%, 3%, 5%, or 10% of their rated values. In this regard, a CPU temp doesn't really need to be reported in a really tight tolerance.
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by amigasociety »

May I ask those fellow X1000 users what their X1Temp dockie reads for all the settings?

On a normal day here are mine.

Case 31C
CPU 43C
Core1 50C
Core2 52C

I have heard others Core 2 being much cooler. After-all... it is not even being used.

Just curious is all.

TJ
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by xenic »

@amigasociety

Today my temperatures are:

Case______96F--------36C
CPU _____120F--------49C
Core1____131F--------55C
Core2____136F--------58C

I just assumed that the Core2 was hotter because it's operating full speed doing nothing.
Last edited by xenic on Fri Oct 31, 2014 7:13 pm, edited 3 times in total.
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by amigasociety »

Ah, I take it these #s are while running Amiga OS and not linux?

I see your Core 2 is hotter too. Must be a common thing then.

;-)

TJ
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by LyleHaze »

I wonder what the chances are that the two core temp sensors have been swapped somewhere along the signal chain?

The device used in the X1000 has one internal sensor and three external ones.
The "typical" accuracy is supposed to be 1 degree Celcius.. typical is not guaranteed.

Just wondering.
:)

[edit] without tracing the tech.. we will probably find out when we start using both cores.
Though there's no guarantee that the load will be divided equally between them.
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by Raziel »

amigasociety wrote:May I ask those fellow X1000 users what their X1Temp dockie reads for all the settings?

On a normal day here are mine.

Case 31C
CPU 43C
Core1 50C
Core2 52C

I have heard others Core 2 being much cooler. After-all... it is not even being used.

Just curious is all.

TJ
Mine are:

Case: 33 °C
CPU: 45 °C
Core 1: 51 °C
Core 2: 48 °C
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Re: Why & Should CPU Core 2 be higher temp than Core 1 ?

Post by AndyGarton »

Not directly related, but when my machine is working hard the CPU core temperatures climb to the high 60s - is this safe? The CPU itself stays under 60 mostly.
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