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i7 4790k temperature really high with no obvious cause

MHess1
Beginner
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I have been running an i7 4790k in my system for years now. Later last year it started to get incredibly hot as soon as the work load increased. I would get low 30s to high 20s in idle but could not put it under high/full load without reaching scary high 80 to 90C temps. With Prime95 it would even reach TJmax and start to throttle.

 

I contacted the support (still under warranty) and they told me the cpu needed to be replaced. They sent me a used unit from the warehouse that was in "good" condition. In the tests I did right away it was running no hotter than 50C under full load.

 

Now, 5 months later, the replacement cpu has developed the same problem and is getting just as hot even though it was running fine when i first tested it. I have ruled out all possible causes like ventilation, cooler, thermal paste, dust, voltage, reset and updated the bios and so on. I just want to use my PC without having to fear it going up in flames all of a sudden. If anybody has some ideas about the cause if would greatly be appreciated.

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8 Replies
LeonWaksman
Super User
456 Views

Hi,

Is the board, fans and air inlets/outlets clean from dust?

 

Leon

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MHess1
Beginner
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LeonWaksman
Super User
456 Views

Did you check your CPU with Intel Processor Diagnostic Tool? If not, please do it: https://downloadcenter.intel.com/download/19792/Intel-Processor-Diagnostic-Tool

 

Leon

 

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n_scott_pearson
Super User
456 Views

Have you verified that the fan speed control programming in the BIOS hasn't been disturbed?

What exactly is "just as hot"?

 

...S

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MHess1
Beginner
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I checked the BIOS settings and just in case reset all settings to rule out any modification

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n_scott_pearson
Super User
456 Views

What exactly is "just as hot"?

 

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Wanner_G_Intel
Moderator
456 Views

Hello MHess1,

 

Were you able to run the tool recommended?

 

Wanner G.

Intel Customer Support Technician

Under Contract to Intel Corporation

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Wanner_G_Intel
Moderator
456 Views

Hello MHess1,

 

If you need further assistance, please contact us back.

 

Wanner G.

Intel Customer Support Technician

Under Contract to Intel Corporation

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