One CPU core running drastically hotter than others

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adhdluke

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Jan 5, 2017
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I just got a new gaming computer built and sent to me. It has a core i7 7700 inside, and since it came with the stock intel heatsink, I decided to check out how bad it was
I disabled turbo boost because I really didn't need the extra performance, and I'm conscious about the health and longevity of my devices
I got OpenHardwareMonitor and immediately noticed something a little off. It shows 6 temps for the cpu, and #3 is always running extremely hot. All the other readings max out at the very most between 90 and 120 degrees Fahrenheit, whereas this one core is almost always running at at least 170 degrees Fahrenheit
Do you think this could be a problem with the sensor, possibly poorly applied thermal paste, or is this somehow normal?
 
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Karadjgne
The 7700 is a 4core/8thread cpu. Showing 6 results for cores is suspect, you should only ever have 4 core results as hyperthreading is a single core running 2 threads, so you don't get separate results. Personally I'd use Realtemp as it was written specifically for Intel cpu's and gives as accurate results as possible for software. I'd also compare the results against the OHM results, see if core #3 is still running hot (77°C) under minimal loading.

Turbo is a factory set OC that's well within any and all specs for the cpu and doesn't hurt longevity in the slightest.
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Dugimodo

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Sep 22, 2011
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No that seems very hot even with a stock cooler. Unless something is loading up that one core for some reason, checked task manager.
You could check the temps in the BIOS to see what they are idling at, and try a different monitoring program as sometimes they don't read some chipsets right.

Turn turbo back on, it only does anything when there is a load to use it and makes no difference when there isn't. What you end up doing is having the PC work longer rather than quicker. I seriously doubt turbo will shorten your CPUs lifespan. My overclocked 6700K has been turboing it's little heart out for 2 years+ so far.

Also because this is a new PC I'd recommend contacting the supplier with your concerns, better for everyone that it's sorted now under warranty rather than waiting.
 
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Karadjgne

Karadjgne

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The 7700 is a 4core/8thread cpu. Showing 6 results for cores is suspect, you should only ever have 4 core results as hyperthreading is a single core running 2 threads, so you don't get separate results. Personally I'd use Realtemp as it was written specifically for Intel cpu's and gives as accurate results as possible for software. I'd also compare the results against the OHM results, see if core #3 is still running hot (77°C) under minimal loading.

Turbo is a factory set OC that's well within any and all specs for the cpu and doesn't hurt longevity in the slightest.
 
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TJ Hooker

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@Karadjgne having 6 temp readouts isn't necessarily suspect. I would guess it's cores 0-3, core max (temp of hottest core), and package temp.

Having 1 core ~30C hotter than the others is certainly unexpected though. @adhdluke have you looked at CPU usage, to see if one core is being heavily loaded?
 
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adhdluke

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Jan 5, 2017
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No cores are being heavily loaded and I have the monitor set to open at startup. (Startup takes around 20 seconds from pressing power to getting to desktop, probably because my boot device is an SSD)
I don't think the six temperature readouts is suspicious because I think they're temperature sensors on the motherboard, not six CPU cores. It shows that there are for CPU cores where it shows the voltages.
I'm almost certain it's a bad sensor considering the readouts immediately after startup. I'll contact the supplier and see what they can do, and if it's a real issue. I haven't had any performance problems, (thermal throttling, overheat, etc.) and I'm hoping I can just leave it be, at least for now.
quick edit: I got realtemp, and it's showing all four CPU cores running cool. I'm pretty sure it's just a sensor on the motherboard or something

The motherboard is an ASRock B250M-HDV
 
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