Question cpu speed drops below base speed when gaming

Jun 28, 2020
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hey guys,

I have a,
gigabyte rtx 2070
intel 17-8700k 3.70ghz
16g of ram
asrock z390 phantom gaming mobo

when im not playing or doing anything my cpu speed is higher than the base speed of 3.70ghz, once I go to play pubg, the speed going far below 3.70, it goes to 1.56ghz or even much lower. i dont know what is the problem, someone please help.
 

Furzumz

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May 28, 2020
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What are your temperatures for your CPU?

Video cards and processors like to throttle themselves if temperatures raise too high in an attempt to avoid possible hardware damage
 

Furzumz

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May 28, 2020
149
16
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Furzumz

Proper
May 28, 2020
149
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The maximum temperature your CPU allows is 100c and your temperatures are hitting that amount dead on.

Your CPU is running WAY too hot causing your CPU to underclock itself to try to avoid damage

As far as whats causing your CPU to overheat, it could be from different things.

  • Did you apply thermal paste when installing that CPU?
  • When was the last time you blew the dust out of your computer case using some compressed air?
  • Is your CPU cooler working and installed correctly?
  • Are you overclocking your processor?
 
Jun 28, 2020
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so this computer i bought from ibuypower prebuilt, i never check the thermal paste, i did use the air can to get dust out, i dont know how to check if the liquid cooler is working properly, and i never overclocked how can i check to see if its overclocked?
 

Furzumz

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May 28, 2020
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so this computer i bought from ibuypower prebuilt, i never check the thermal paste, i did use the air can to get dust out, i dont know how to check if the liquid cooler is working properly, and i never overclocked how can i check to see if its overclocked?
How long have you had this PC for?

When you blew the dust out did you make sure to blow the dust out of the radiator? (see image below)

Also is your liquid cooler an all in one cooler or a custom loop cooler? I assume its probably an all in one cooler. If so is the pump plugged in? You should see a little wire on the part of the cooler that sits on the processor. There should be a wire on that plugged into the motherboard somewhere.

There should be a fan on the metal radiator as well (also see the below image). Is the fan spinning?

https://ae01.alicdn.com/kf/HTB1MLNlX3vGK1Jjy0Fbq6z4vVXaF/ID-COOLING-AURAFLOW-120-RGB-SYNC-AIO-Water-Cooler-with-240mm-Radiator-120mm-RGB-PWM-Fans.jpg_960x960.jpg
 

Furzumz

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May 28, 2020
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ya its plugged in and spinning, i have had this computer for maybe 2years or just under 2 years
Could you also answer the other questions? Forgive the barrage of questions but its a process of elminination as overheating can be caused by a handful of different things.

Another thing I forgot to ask, do you see any visible kinks in the tubing on your liquid cooler?

As far as telling if your liquid cooler is dead...that can be tricky. Sometimes the pump can audibly die, other times its silent.

Find where your radiator is and hold your hand close to it on both sides of the radiator (I wouldn't touch it, just put your hand close to it). If you feel a good amount of heat being blown out that could be a sign its still working

If you feel little to no heat despite your processor being pegged at 100C it may very well be dead.
 
Jun 28, 2020
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should i be hearing water passing through the tubs? because i dont hear anything

the back of the casing doesnt feel hot at all, where the fan is spinning.
 

Furzumz

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May 28, 2020
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do i use the can on the inside blowing into the fan out the back? or from the back into the casing?

I dont feel heat coming off the radiator.

dont see any kinks

the tubs themselves feel warm
its an all in one cooler View: https://i.imgur.com/g4p80JU.jpg
Thanks for the extra info

Tubes look fine so we can rule out tube kinks

When you go to blow the dust out make sure your computer is off or put in sleep mode. Don't want dust bunnies being sucked up by any fans

Technically I think you're supposed to use the compressed air in the opposite direction of where the fan is exhausting heat (so you'd want to go to the back of the case and blow out the radiator from there)

But I say just do both front and back of the radiator, can't go wrong with that.

After you blow it out double check the front and back of your radiator for heat being exhausted. If you don't feel much or any heat being exhausted, your pump is probably dead and you'll need a new cooler.

should i be hearing water passing through the tubs? because i dont hear anything
You likely won't hear water moving even when its working

this is my comp atm without playing any games all day and nothing open but me reading on these forums View: https://i.imgur.com/VvxxLzg.png
Yeah 90c just browsing the forums is way, way way waaaaay too hot. Even under game load that's too high
 

Furzumz

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May 28, 2020
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Another thing, I think your radiator setup might be exhausting heat into the case rather than pushing it outside the back. Make sure to check the inside of your case to see if you feel any heat being exhausted from the radiator fan.

If you don't feel a good amount of heat coming from either direction of that radiator fan then I'm heavily assuming your water cooler pump died.
 
Jun 28, 2020
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ok im going to shut down the computer and try to blow out the radiator again. if i dont feel heat coming out the back then its not working? think maybe the thermal paste is the problem too?
 
Jun 28, 2020
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no heat pushing into the casing from the fan

can you recommend a good cooling system i can buy btw?

also thank you for taking your time to talk with me and help out with this problem you are very kind for doing so! thank you so much!
 
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