Why does my CPU temp Spike?

Blackler

Commendable
Feb 4, 2017
8
1
1,510
Hey Folks,

I'll try to keep this brief and simple if I can.

Basically....

I've got my Processor OC'ed to 4.5 GHz.

It's a....
- i7 6700k (Stock 4.0GHz & 4.2GHz Boost)
- H100i with Push/Pull fan setup
- EVGA 850w P2
- ASUS Z170 Pro Gaming Aura MoBo
- 16GB DDR4 RAM

I've tried various OC's with this Setup with various voltages and stress testing to make sure it's all stable before I get using it for everyday stuff.

Thing is, I'm now at 1.33v with 4.5GHz and I get roughly around 50c (+/-3c) while gaming.
(Tested on Witcher 3 at Ultra settings, utilising around 50% CPU)

With AIDA 64, I'm sitting around 60c (+/-2c) when at 100% CPU Usage.

But the weird thing is, when playing Games, like the Witcher, I'll sit in between 40 and 50c, even dropping to 39c at times, but when I check the monitors (HWMonitor and MSI Afterburner) my CPU is spiking to 70 even 75c for a split second. (I notice this IN GAME as well as after when I check the recorded stats)

When I had the CPU at 4.7GHz (1.4v) it was spiking to 78c at times which is why I bought it down to 4.5GHz and 1.33v.

These spikes are very short lived, they spike for a split second then that's it. It happens once every 30 seconds or so but it does make me worry.

It doesn't help either that my temps are up and down like a yo-yo at the best of times anyway.
(Witcher 3 is up and down between 40 & 50 with temps changing ever 0.1 seconds)

I'd appreciate any feedback and to have any input. If not just to answer my question, but for future reference also. I.E. The reasons the temps are up and down so much, why I should/shouldn't be worried!

Cheers folks,

Andy


 
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Reactions: Lilnicky66
Hello... Do you have the Boost feature of the CPU disabled?
Basically the thermal sensor is in the CPU, and the best/fastest spot for a reading... the cooling system/thermal transfer, does not have as fast reaction or recovery to these changes. In other words you can electrically heat the CPU faster than you can Water cool it in your system.
 

t53186

Distinguished
Agree with Ironsounds, additionally the CPU spike are normal, spike are caused by a very short need for maximum computing power available from the CPU, More power=More heat. The CPU is thermally protected internally and will start to complain or shut down if too hot (lagging, blue screens, shutdowns).

No you should not worry, everything is working as expected
 

Blackler

Commendable
Feb 4, 2017
8
1
1,510
Thanks for your answers folks. Appreciate both your replies.

One extra thing I'll ask though in relation to this.

The temperatures, when they're jumping up to 70+, would these be considered null?
As I said, the temps last for less than a second so it's not like the processor is hot for long.

Cheers!