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High CPU temps for new build?

post #1 of 7
Thread Starter 
Put it all together a few weeks ago, and just recently noticed when I go into the UEFI BIOS it shows a temp of 47.0C for the CPU fan. Is this normal? It's a core i7 7700k. I thought for sure temps would be lower.
post #2 of 7

The UEFI BIOS is using the CPU at the same time, so it will be a little warmer.

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post #3 of 7
How are your load temps? It's quite a bit higher than what I get sitting in the BIOS...usually sits in the high-20's range (7700K w/ D15 cooler on Maximus IX Hero). But, if load temps are good, then I wouldn't stress much about it. smile.gif
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by francisw19 View Post

How are your load temps? It's quite a bit higher than what I get sitting in the BIOS...usually sits in the high-20's range (7700K w/ D15 cooler on Maximus IX Hero). But, if load temps are good, then I wouldn't stress much about it. smile.gif
load temps go up to about low 70s in realtemp 3.70. when idle it's about 33 it says on the same app.
post #5 of 7
Sounds like your CPU install is lacking CPU paste applied properly.
Not trying to be negative, just a serious suggestion!
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by amstech View Post

Sounds like your CPU install is lacking CPU paste applied properly.
Not trying to be negative, just a serious suggestion!
No worries, I am relatively new to PC building. I will reapply thermal paste and check temps. Thanks!
post #7 of 7
Quote:
Originally Posted by Arv3n View Post

No worries, I am relatively new to PC building. I will reapply thermal paste and check temps. Thanks!

7th generation chips are on average hotheads
70ish under load would be normal
I'm thinking youre using an air cooler here, if you would have a custom loop I'm sure you would've said so

that's why delidding tools are made by 3 different manufacturers, not counting self 3d printable versions; hint: they're popular at the moment
delidding gives a temp drop of 15 to 25 degrees, depending on how generous Intel was on the glue they used when they applied the IHS

well
aside from that


you could have way too much thermal paste, not mounted the cooler right
you could try a different brand when it comes to thermal paste, maybe






you can give this a read on air cooling if youre new

http://www.overclock.net/t/1491876/ways-to-better-cooling-airflow-cooler-fan-data
example on how much paste (Click to show)
Quote:
Originally Posted by doyll View Post

How to Apply Thermal-paste

Tiny dot is all that is needed. . A print like this on CPU is good. No surplus on heatsink. Temp is 50c

http://www.hardwaresecrets.com/article/What-is-the-Best-Way-to-Apply-Thermal-Grease-Part-1/1303/2


Small dot is biggest needed. Print is complete CPU & litte extra. Notice the surplus at top and bottom of heatsink . Temp is 50c too.

http://www.hardwaresecrets.com/article/What-is-the-Best-Way-to-Apply-Thermal-Grease-Part-1/1303/3


Bigger dot that is just too big. Surplus pushed out around CPU. Also on heatsink. And temp is 2c higher at 52c.

http://www.hardwaresecrets.com/article/What-is-the-Best-Way-to-Apply-Thermal-Grease-Part-1/1303/4


Keep in mind all of these are within 2c margin of error. In fact the temperature difference could be as little as 1c or as great as 5c.

http://www.hardwaresecrets.com/article/What-is-the-Best-Way-to-Apply-Thermal-Grease-Part-1/1303/10



Direct Metal to Metal, No TIM Layer In-between!
Be careful not to apply too much TIM. We want only enough to fill the voids in the crystalline structure of the metal where it does not give direct metal to metal contact. We do not what TIM to form a layer between the IHS and cooler base
In case you do not know, TIM heat transfer is not even close to what good metal to metal contact is, but it is much better than what air transfers when there is no TIM in the voids created by the pores of the metal structure.

Heat tranfer ability of different things:
Copper is 400 W/(m·K) heat transfer
Aluminum 210 W/(m·K))
Lead is 35 W/(m·K)
Typical TIM is rated 3.5-10.5 W/(m-K) (GC Extreme 8.5W/(m·K), Chill Factor III 3.5W(m-K) in use this is only 1-2c difference in CPU temp)*
Air is 0.024 W/(m·K)

To put that into perspective, any way you look at it metal to metal is 50 times better than TIM:
Copper is 47 times better than Gelid GC Extreme TIM & 114 times better than Chill Factor III
TIM is 333 times better than air at sea level.

*i don't know how accurate the W(m-K) ratings are onl TIM, but do know the temperature differences between top 30 or 40 TIMs are all within a degree or two, except for liquid metal variants .. which are a degree or two better.



CPU Chip Size Under IHS
Also keep in mind the area of IHS that transfers the heat from CPU chip is much smaller than the total top of IHS. It varies from CPU to CpU. While Intel chips it is generally a square or rectangular chip in the center part of IHS, AMD CPUs sometimes have the chips in the corners.










you can have a look here
http://www.overclock.net/t/1621347/kaby-lake-overclocking-guide-with-statistics
to quote something:
Quote:
Delidding:
Delidding is the process of removing the Integrated Heat Spreader from a CPU package and reapplying the thermal compound found underneath. A popular option is to use CoolLaboratory Ultra (CLU) as the compound. It is not recommended to use normal thermal paste for this. By delidding with a razor or vice you are risking permanent destruction of a CPU. There exist tools to make it safer, however if you don't feel you are up to the task you can purchase delidding service from Silicon Lottery. Once the delid is done the IHS will still come off relatively easily and resale value can go down, but with a Silicon Lottery job you can get it glued back on, so that you essentially have a normal looking CPU package with better temps.

Expect 15C better temps with a proper delidding job. It is possible to run the processor without the IHS. This is called 'bare die' and must be done with caution. If the cooler is mounted overly tight on the processor then the die may crack.


Is there any insurance for my CPU?
Yes. The Intel Protection Plan still exists. For $25-$30 you can stop worrying about overclocking leading to death of your CPU. This is on top of the warranty you get with a CPU purchase. Visit here for details. In general people found that Intel has been pretty lenient in accepting replacements.

and here for a read on what I mean by delidding on a whole thread basis biggrin.gif
http://www.overclock.net/t/1313179/official-delidded-club-guide



btw

this is my 7600k at 5.1 Ghz both with an air cooler ( I think paid 30€ new for this one, something run of the mill)

first before delid


second after




from 88 degrees on hottest core to 66


to sum it all up

if youre using an air cooler it might be normal, even without any overclocking

some are indeed running hotter than others

this is believed to be because there is different amounts of glue used for the IHS
more glue means the DIE and IHS are more apart from another, making heat transfer less and less optimal

this should be the reason why some see "only" a temp drop of 15 degrees, while some have even seen up to 25


these numbers could be tuned a bit by switching the thermal paste, maybe, and making sure youre cooler is mounted right

but we're talking about maybe 5 degrees if those 2 things come together (the cooler cannot be completely wrong sitting, would shut down thumb.gif )

only a delid will give you the temps you think you should have
that's kinda common

and not a problem at all when running stock
Edited by peter2k - 4/15/17 at 7:16am
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