I7 7700k temps spiking on idle, Normal?

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Chichee25

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Feb 25, 2017
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I've recently purchased an i7 7700k CPU together with an Gigabyte Aorus Z270x Gaming 5 motherboard and 16 GB DDR4 3000 MHZ HyperX Predator memory. The CPU cooler is a Deepcool Lucifer V2, which I've previously used on an i5 2500k without issue.

The issue I have been having is, while the computer sits idle in Windows, CPU temperature is at around 35-40 C, but as soon as a short task appears for the CPU to execute (or at times, randomly) , the temperature on the cores jumps to 65-75 C in a second or so, sits there a second or two, then drops down to previous temperature just as fast.

It scares me to play games like Crysis 3 or GTA V.
 
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Danra
You did not mention how many cores were spiking 65 to 75 degrees C.

Using Windows 10 Pro, it is normal for that CPU and motherboard for temperatures to spike momentarily, especially on one core, even opening Firefox will do it. However, 65 to 75 degrees C is a bit high unless you have the CPU overclocked to around 5GHz on all cores, even then, only one core should spike above more than 3 degrees from idle unless the program can open using more than one core. By the way, the more times the same software is opened repeatedly [that is, opening and closing repeatedly in rapid order], the higher the temperatures spike can be each time, or nearly each time.

Try using HWiNFO64 to check [CPU] core temperatures...
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Danra

Danra

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May 25, 2005
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You did not mention how many cores were spiking 65 to 75 degrees C.

Using Windows 10 Pro, it is normal for that CPU and motherboard for temperatures to spike momentarily, especially on one core, even opening Firefox will do it. However, 65 to 75 degrees C is a bit high unless you have the CPU overclocked to around 5GHz on all cores, even then, only one core should spike above more than 3 degrees from idle unless the program can open using more than one core. By the way, the more times the same software is opened repeatedly [that is, opening and closing repeatedly in rapid order], the higher the temperatures spike can be each time, or nearly each time.

Try using HWiNFO64 to check [CPU] core temperatures. https://www.hwinfo.com/news.php

And, let us know what TIM you are using and how you apply it.

Here is a review of TIM [between the cooler and CPU lid {IHS}] with air cooling: http://overclocking.guide/thermal-paste-roundup-2015-47-products-tested-with-air-cooling-and-liquid-nitrogen-ln2/6/

I started working in the computer field over 30 years ago and began overclocking as a hobby about 25 years ago or more. I have had experience with many different computer companies and products over the years, and because the industry is in an almost constant state of change I keep learning.

EDIT: The power supply can have an effect as well. What power supply are you using and how old is it?
 
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