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Some cores running hotter than others 3570K

post #1 of 6
Thread Starter 
Hi,

I am rendering some video files at the moment and core 0 is running at 69 degrees C whereas core 3 is running at only 52 degrees C.

Does anyone know why this could be?

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post #2 of 6
My 2500K does this too. I don't worry about it. Think it is normal.
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post #3 of 6
Quote:
Originally Posted by jimbolevy View Post

Hi,

I am rendering some video files at the moment and core 0 is running at 69 degrees C whereas core 3 is running at only 52 degrees C.

Does anyone know why this could be?

Sent from my GT-I9505G using Tapatalk 2

A 17C spread would lead me to believe that either:

A. Improper thermal paste spread, or heatsink mount pressure.
B. Encoding is not using 100% resources for Core3, maybe to be left to the system

Try a traditional stress test (P95) and see if you can duplicate the results. If the results are duplicated in synthetic testing, you have a heatsink interface issue.
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post #4 of 6
A quick way of checking CPU usage while you're rendering is to start 'Task Manager' and choose the 'Performance' tab. 'CPU Usage History' will give you a rough guide to each core's usage. It helps if you increase the size of Task Manager to view the graphs.

Most of my Intel multi-cored CPUs have had a temperature difference between the cores although 17ºC is quite a difference.
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post #5 of 6
Also worth noting: not all cpu activity generate identical amount of heat; some operations are more demanding than others, even though both may cause "100% cpu usage", so the only way to determine the "real" difference in temperature is to run identical types of loads on all cores, for example, running Prime 95, as inedenimadam suggested. My previous CPU, i5-2500k had ~10 Celsius differences between cores at most when under P95 stress, my current cpu, i5-3550, have ~7 Celsius differences between cores when under identical load. The cores are pretty close to each other, and the IHS spreads the heat pretty well between cores, so improper thermal paste spread etc don't really cause that much harm.
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post #6 of 6
That's a pretty large discrepancy but not abnormal. Core 0 is likely getting pushed harder than the rest. At full load, my 3770K's core #2 ran 5-6c hotter than the rest. Problem was fixed after I delidded and applied new TIM.
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