i7-8700k Temperature jumps

[johnmallorca]

Hello,

I'm currently having problems regarding temperature with the i7-8700k - On idle my temperatures are low.

But as soon as I hit the run button on Cinebench my temperatures go like this

This is going from the normal 20-30 idle temps to the 60-80 high temps within a second. After Cinebench has done what it has done the temps go back to the low 20-30's

I have reseated the cooler, applying thermal paste, twice.

I have an NZXT x52 Kraken cooler and a Strix Z370-E motherboard. CPU is obviously i7-8700k
Is this something to be worried of? Will this damage my CPU? How do I fix this if this, if I can or need to.

 

[vMax]

This is completely normal..Your idle temps are good and your max temps under load are ok, not brilliant. The 8700K does also occasionally spike to higher temps. My 8700K at 4.8GHz, just did a run tops out at 70 degrees C on 1 core and mid to late 60's on the others but I have a 360 AIO and it is fairly cool in London at the moment, so I think you are okay.

 

[norcalsc]

Agreed, I was wondering if I was missing something. Normal, carry on....

 

[vMax]

Agreed, I was wondering if I was missing something. Normal, carry on....

Yep, not an issue...enjoy your system...The 8700K is on good CPU..

 

[johnmallorca]

This is completely normal..Your idle temps are good and your max temps under load are ok, not brilliant. The 8700K does also occasionally spike to higher temps. My 8700K at 4.8GHz, just did a run tops out at 70 degrees C on 1 core and mid to late 60's on the others but I have a 360 AIO and it is fairly cool in London at the moment, so I think you are okay.

But it is not the occasional temperature spike. Using cinebench brings the temp from the lower end to the higher end almost immidiately and happens everytime. Any game that I run will put a bit of load on the CPU and the temp jumps as well.

 

[vMax]

This is completely normal..Your idle temps are good and your max temps under load are ok, not brilliant. The 8700K does also occasionally spike to higher temps. My 8700K at 4.8GHz, just did a run tops out at 70 degrees C on 1 core and mid to late 60's on the others but I have a 360 AIO and it is fairly cool in London at the moment, so I think you are okay.

But it is not the occasional temperature spike. Using cinebench brings the temp from the lower end to the higher end almost immidiately and happens everytime. Any game that I run will put a bit of load on the CPU and the temp jumps as well.

I should have made that clear..when running Cinebench, yes it immediately hits 70 degrees on the occasional spikes, I just meant on normal use, not with Cinebench..

 

[johnmallorca]

But what I mean with the entire thing is that there are no steady temperatures at all - I never see a steady increase or steady decrease on the temps. It's all sudden. As an example, I've just turned on my PC and it was 25 degrees to begin with, as soon as I launch anything that increase the load on the CPU, even if it's just a tiny bit, the temps go up instantly. I launched a game and it wen't up to 40 immediately. I closed it and temps went back to 30-25.

 

[Karadjgne]

Loads are instant. The game or cinebench doesn't startup slowly and gain speed at a decent rate, it's instantly running as fast as the cpu can make it. Intel cpu's have a temp sensor directly on the cores. They'll read temps several times per second. So when you add a full load, like starting cinebench, you are most definitely going to see almost instantaneous jumps from idle speeds and temps to load speed and temps.

Picture it this way. You at a drag race. The car will sit on that line all day waiting, until it gets the green light and 'bam', stomp on the gas and the car is flying down the strip. That's you starting cinebench, gave the cpu the green light. It'd be kinda a sad race if the car just rolled across the line, changing gears as if grandma were driving it, and taking 20 miles to get to top speed.

As to inconsistent temps, that's a degree of workload. Loads are not exactly the same at all times, some code strings require the cpu to work a little harder, some are quite easy to shove through. So the on-core sensors are reading a constantly changing load, and as a consequence a constantly changing temp.

 

[mjbn1977]

absolutely normal! 70s is not bad during benching....

You shouldn't have re-seated that cooler multiple times. that was a waste of time. The 8700k is a hot running processor. But nothing wrong with it. If you run benchmarks using AVX instructions you might see it even go into the 90s.....

The instant heat is normal. As soon as the processor is 100% used the heat will be there instantly. there is no time for heating up.... 🙂

During gaming you will probably see temperatures around mid 60s to mid 70s. And this is absolutely fine! The processor even can take constant mid 80s (even so that would not be ideal). You just don't want to run it too long in the 90s, but even this would not really damage it, but maybe degenerate it a little faster....