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CPU GT core temperatures


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I'm getting really weird temperature readings on my i5-4690.  This is (I think) causing my BIOS to spin my fans far too quickly.



CPU 37 °C  (99 °F)
CPU Package 78 °C  (172 °F)
CPU IA Cores 35 °C  (95 °F)
CPU GT Cores 78 °C  (172 °F)
CPU #1 / Core #1 34 °C  (93 °F)
CPU #1 / Core #2 33 °C  (91 °F)
CPU #1 / Core #3 33 °C  (91 °F)
CPU #1 / Core #4 35 °C  (95 °F)
PCH Diode 40 °C  (104 °F)
GPU Diode 31 °C  (88 °F)
This is at idle.  Why is the integrated graphics (Intel HD 4400) running so hot when the cpu cores are all fine?  I have a good cooler (Coolermaster Seidon 120M).  As a result the 'package' temperature is over 40 degrees hotter than the hottest core.
It is even more odd because I have a discrete graphics card, so I don't even use integrated graphics.

What is the problem?  Bad temperature sensor?  Faulty CPU?  Bad application of thermal paste?
Many thanks for any help
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IMHO it is most likely due to a faulty iGPU temperature diode, or due to a temporary malfunction. Try to completely power off your system. Shutdown Windows, and disconnect your computer from the wall plug (A/C power). Leave it disconnected from the power for at least 2 minutes, then connect it again, start your PC, and see if it makes any difference. If not, then probably your only chance to get things back to normal is by replacing your CPU (which should still be under warranty I guess).



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