i8700k Overheating - 100C

ari500 · Dec 23, 2017

Hello there and thanks for taking the time out of your day to read this!

Computer Speccs
Processor: i7-8700k CPU @ 3.70 GHZ
Cooling: Noctua NH-U9S CPU
Motherboard: ROG STRIX Z370-F GAMING
GPU: ROG STRIX-GTX1080-A8G-GAMING
RAM: G-Skill Trident 2x8GB 3200Mhz
PSU: Corsair TX850M, 850W PSU
SSD: Samsung 960 EVO 250GB M.2 PCIe SSD
CASE: NZXT S340 Midi Tower

More INFO
I have thermal Paste on CPU cooler.

My Problem:
When i play demanding games such as PUBG/DESTINY my CPU overheats to around 100 degress (212 F)

How i came to this conclusion:
I decided to do a "System Stability Test" In: AIDA64.
My results were:
GPU: 60-65 Degrees.
SSD: 35 Degerees.
Motherboard: 25-36 Degress.
CPU Core 1: 89 Degrees, Core2: 92 Degrees, Core3: 97 Degrees, Core4: 100 Degress, before my OS shut down.

- AIDA64 Result (IMG)

- Computer Fans (IMG)

What i have tried
I have ran IntelProcessor Diagnostic Tool 64bit, and my CPU handled it well with 0 problems.
+ I will also try to re:mount the CPU fan.

Also some basic things such as CPU throttle, by going for energi mode to performance mode in windows and Bios.

Mark RM · Dec 23, 2017

Your cooler can't be making decent contact with that CPU, make sure it's seated correctly and that you use only a little thermal paste, more is not better.

Major_Trouble · Dec 23, 2017

You seem to be missing 2 x cores as well.

You shouldn't have those temps @ 3.7ghz. If it's not a poorly contacting cooler you should check your voltages. If it isn't any of those I suspect you might have a duff cpu.

You have fitted the fan the right way around?

ari500 · Dec 23, 2017

Mark RM :

When i unscrew the CPU cooler i can see that the thermal Paste has been squished out, so it seems that the CPU and cooler has direct contact with each other.

ari500 · Dec 23, 2017

Major_Trouble :

When i open task manager i can see all 6 cores and in my Bios, propably just something with AIDA64.
The cooler dosn't seems to be poorly contacted, when i unscrew the screws i can see that the thermal paste has been squished out a little bit. As for voltages i dont know much about that

Mark RM · Dec 23, 2017

It could be the problem is with AIDA
Try hwmonitor

Major_Trouble · Dec 23, 2017

ari500 :

The fact AIDA64 doesn't list all your cores has me questioning it's readings. Make sure you have the latest version.

If you run CPUz you'll be able to see your core voltage when in Windows and stressing you cpu.

You don't need a lot of paste that it squeezes out. Just a thin covering to fill in any imperfections in the contact surfaces between the cooler/cpu. If they were an absolute perfect fit you wouldn't need any at all.

ari500 · Dec 23, 2017

Major_Trouble :

ari500 :

The fact AIDA64 doesn't list all your cores has me questioning it's readings. Make sure you have the latest version.

If you run CPUz you'll be able to see your core voltage when in Windows and stressing you cpu.

You don't need a lot of paste that it squeezes out. Just a thin covering to fill in any imperfections in the contact surfaces between the cooler/cpu. If they were an absolute perfect fit you wouldn't need any at all.

Hi, just tested CPU z and this were my results:

Now i can sell all 6 cores and 12 threads.
And i noticed that my voltage (1,425+) seems very high, (this was my deafult settings)

Major_Trouble · Dec 23, 2017

ari500 :

Major_Trouble :

Hi, just tested CPU z and this were my results:

Now i can sell all 6 cores and 12 threads.
And i noticed that my voltage (1,425+) seems very high, (this was my deafult settings)

1.425v isn't overly high but it's probably a lot more than your 8700k needs for 3.7ghz. You should try setting it lower and not letting it go Auto in the bios. Start with something like 1.35v to see if your stable and temps are lower.

ari500 · Dec 23, 2017

Major_Trouble :

ari500 :

1.425v isn't overly high but it's probably a lot more than your 8700k needs for 3.7ghz. You should try setting it lower and not letting it go Auto in the bios. Start with something like 1.35v to see if your stable and temps are lower.

I im aming for 1,35 voltage, but its really hard to understand UEFI BIOS. Beacuse there are 3 options CPU Core voltage/CPU Cache voltage/CPU System agent voltage, and none of them is set over 1,35v and i still manage to get 1,4v+ in stresstests

Major_Trouble · Dec 23, 2017

ari500 :

Major_Trouble :

ari500 :

1.425v isn't overly high but it's probably a lot more than your 8700k needs for 3.7ghz. You should try setting it lower and not letting it go Auto in the bios. Start with something like 1.35v to see if your stable and temps are lower.

I im aming for 1,35 voltage, but its really hard to understand UEFI BIOS. Beacuse there are 3 options CPU Core voltage/CPU Cache voltage/CPU System agent voltage, and none of them is set over 1,35v and i still manage to get 1,4v+ in stresstests

It should be CPU core voltage and is usually set to auto. You might have to apply a - offset to force it lower.

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