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Incorrect CPU usage?


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#1 Rewster

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Posted 12 February 2013 - 07:35 PM

Just wondering, but does the Task manager not show the correct CPU amount that is being used? I am showing 90% - 100% usage currently on task manager, while Intel XTU is showing 65%-75%, and CoreTemp showing similar numbers to Intel XTU.

 

Which numbers would be better to trust? 

 

I use an i7-3770k overclocked to 4.2Ghz with Windows 8 Pro.


Edited by Rewster, 12 February 2013 - 07:36 PM.


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#2 James Litten

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Posted 13 February 2013 - 12:03 AM

It has been awhile since I delved into this but I believe that in Windows the idle task is used in the calculation. You see it listed as System Idle Process. Then the remaining CPU usage is divided amongst the other tasks based on how much work each task has queued up. The calculation is done by the OS.

 

It is certainly possible that the Intel program determines CPU utilization in a different way and that would explain the difference. I think Linux does it differently also (no idle process).

 

You could try a Linux LiveCD and see if it reports similar numbers to the Intel program (if the Intel program has a Linux version).

 

So both numbers are correct. They are probably just using different algorithms. Since you are running Windows, you should go by the numbers that Windows gives since Windows will make decisions on allocation of resources based on its own calculations.

 

James



#3 Rewster

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Posted 13 February 2013 - 12:45 AM

Alright. The computer does get sluggish when it gets close to 100% on task manager, even when XTU shows lower than 80. And it seems overclocking the cpu doesn't make any difference in how much of the cpu is used. I am new to overclocking, so idk if that was supposed to affect it in the first place or not. I went from 3.7Ghz to 4.3Ghz and nothing changed in the % used.






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