Core temp variances.

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DaddyBradley

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Feb 12, 2014
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I just downloaded RealTemp to help while I lower my VCore. After my first 30 min of Prime95 I looked at RealTemp and its showing that one what I assume to be one of my cores is running approx +8C hotter than the others.

How much of a difference does there need to be before I should be concerned? Could it be the placement of my EVO?
 
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The temperature sensing diodes are not precision instruments and neither are the ADCs inside the CPU so the absolute accuracy is relatively poor.

If you look at a die layout, you can see that on a quad-core Intel chip, you have one core next to the IGP, one core at the other end of the die and two more cores in-between. Since the core at the IGP end has the whole IGP to help get rid of its heat, it will tend to run coolest. The core at the other end of the die has the rest of the IHS helping it get rid of its heat so it will usually be the second coolest. The middle two cores are sandwiched between two other active cores so they have a lot less area to push heat out with and run hottest.

On my i5-3470 with stock cooler, the difference...
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Titan
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May 18, 2007
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The temperature sensing diodes are not precision instruments and neither are the ADCs inside the CPU so the absolute accuracy is relatively poor.

If you look at a die layout, you can see that on a quad-core Intel chip, you have one core next to the IGP, one core at the other end of the die and two more cores in-between. Since the core at the IGP end has the whole IGP to help get rid of its heat, it will tend to run coolest. The core at the other end of the die has the rest of the IHS helping it get rid of its heat so it will usually be the second coolest. The middle two cores are sandwiched between two other active cores so they have a lot less area to push heat out with and run hottest.

On my i5-3470 with stock cooler, the difference between coolest and hottest is usually around 5C - but that's at 50-60% load.
 
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