Why is my CPU Overheating

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lilayzee

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Oct 4, 2017
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Hello.
I have built a PC and am trying to run some bench marks but every time I run them my CPU overheats.

Info about my build.
- Intel 8700k
- Asus Maximus X Hero
- 16gb Trident Z RGB
- cryorig R1 Universal CPU fan
- Thermaltake view 71 case
- 8 Thermaltake rgb riing fans installed
- ASUS 1080ti
- Arctic Silver 5 thermal paste

I was just running the PC Mark 10 benchmark when I first noticed it so I stopped the benchmark. I proceeded to download prime95 and run a stress test and the same thing happened. I have both Real Temp and HW Monitor and all the cores on my CPU hit 100 degrees within 2 seconds of starting either test. I didn't think it would be possible to rise so fast, its basically instantly. My idle temps are hovering between 30-35 degrees on cooler days and anywhere between 35-45 degrees on warmer days (I'm from Australia and it can get upto 40 degrees here at the moment in summer). Its idling at 33 degrees at the moment and its cool at night time. I haven't really done anything heavy with my PC because I've just been doing the drivers and what not, and I've had HW monitor pretty much from the get go and I've never had problems with temperatures till the benchmarks. Does this mean I installed the CPU fan incorrectly, as in not mounting it or not applying the thermal paste correctly. I thought that if I installed the fan incorrectly that the idle temperatures wouldn't be doing as good either, or is that not the case?

Any help or advice is much appreciated.

Thanks
 
Solution
geofelt
At idle, a good cooler like yours should show 10-15c. over ambient.

Yes, I expect that the cooler is not mounted well.
Dumb question... Is there a protective film on the bottom of the cooler that you did not remove?
That is one answer to the rapid rise in temperature.

It is easiest to remove the cooler when the cpu is warm; do so after a quick power on.

Clean off both surfaces with alcohol. Purer the better.
I use a paper coffee filter to clean off paste because it is lint free.

Thermal paste is an insulator. Its purpose is to fill in microscopic pits in the mating surfaces.
Peas are big, think more like a rice grain.
A very small rice sized drop will spread under heat and pressure.
It is hard to use too little.

When the cooler...
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lilayzee

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Oct 4, 2017
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Dam. I kind of was expecting this but was in denial because its going to be a lot of work to redo the cpu fan haha. Thanks for the reply. I will re install the CPU fan and reapply the thermal paste and report back.

So its not strange for the temperatures to shoot from 30 degrees to 100 degrees in the matter of 1-2 seconds? I found that hard to imagine.

I didn't do the pea method, I used a long thin vertical line. on the arctic home page it was advised to do the vertical thin line on the application instructions. Here is the link http://www.arcticsilver.com/pdf/appmeth/int/vl/intel_app_method_vertical_line_v1.1.pdf Should I just try the pea method?
 
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lilayzee

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Oct 4, 2017
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540
I was going to take the motherboard out to reinstall it. I guess I'll try with it in the case first. Should be okay.

Thanks again for all the tips. Ill let you know how it goes and if the temperature levels improve.
 
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geofelt

geofelt

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Oct 9, 2006
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At idle, a good cooler like yours should show 10-15c. over ambient.

Yes, I expect that the cooler is not mounted well.
Dumb question... Is there a protective film on the bottom of the cooler that you did not remove?
That is one answer to the rapid rise in temperature.

It is easiest to remove the cooler when the cpu is warm; do so after a quick power on.

Clean off both surfaces with alcohol. Purer the better.
I use a paper coffee filter to clean off paste because it is lint free.

Thermal paste is an insulator. Its purpose is to fill in microscopic pits in the mating surfaces.
Peas are big, think more like a rice grain.
A very small rice sized drop will spread under heat and pressure.
It is hard to use too little.

When the cooler is clamped down, see that it is done evenly.
Is your cooler fan plugged in to the cpu header on the motherboard and is it spinning?


 
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Solution
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lilayzee

Prominent
Oct 4, 2017
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540

Thanks for the reply.

I'm not sure if there is a plastic film on the bottom of the cooler. I'm about to do the job now. I will check for that to make sure. I purchased the arctic silver arctic clean to get the surfaces cleaned up. Is it okay to use that over alcohol? I will make sure I do the small dot in the middle method.

Yea the cpu fan is defiantly plugged in and working so it sounds like I did a poor job installing it.

I was a bit worried I did damage to the CPU because the benchmark was running for about 5 minutes before I picked up the high temperature. I heard my CAM software beeping from outside the room so I went to check it out and all three, CAM software, Real Temp and HW Monitor were showing temperatures of 90-105 degrees Celsius. Could 5 minutes of benchmarks cause any permenant damage to my PC? I can use my PC fine and do web browsing and what not without the temperatures going over 45 degrees Celcius, it was just when I tried to run the benchmarks. Should I be worried?
 
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lilayzee

Prominent
Oct 4, 2017
34
0
540
I have reinstalled the fan and am glad to report good temperature readings now. My cpu idles at ~28 degrees Celsius and ~57 degrees Celsius during the prime95 stress test.

I actually did happen to leave the plastic film on the cpu cooler heatsink lol. Pretty shocking rookie error. Hopefully no damage was done in the process. We live we learn.

Thanks for the tips.
 
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geofelt

geofelt

Titan
Oct 9, 2006
54,291
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AS cleaner does a good job; I used to use it.
I no longer do, in favor of 91% isopropyl alcohol.
I use paper coffee filters to wipe off because they are lint free.

Not to worry about damage.
When the cpu detects a dangerous temperature, it will slow down or even shut off to protect itself.
That is around 100c.
 
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