6700k Fluctuating Temps by up to 20 C?

[Sisqo102]

Hey everyone,

Here is a screenshot from intel's extreme tuning utility showing the fluctuation. This is using the stress test and at 100 percent CPU load.

It's relatively hot in my apartment and my package temp is idling at around 38 C and will sometimes jump up by 10-15 degrees but the fluctuation is much more clear when under load. Those peak differences are about 15-20 C. The max peak was 73 C. The lower points are about 52 C. Core temp shows fluctuation like this between readings as well.

As you may see I'm running a slight overclock but if anything I have turned down the voltage from stock. Using auto voltage on my Maximum Ranger VIII, the voltage would also fluctuate and sometimes get up to 1.45 which I thought was quite high for stock so now that is more stable but still the varying temps.

I have tried reseating my Hyper 212 EVO with new paste application and may have lost 2C.

That's all the info I can think of. I guess I'm wondering if (and hoping that) this is normal/acceptable? I haven't had any crashing while gaming or stress testing so far.

What do you all think?

Thank you

 

[nooneisback]

Is it possible to see the temperatures of all cores during a test?

 

[Sisqo102]

Yes, here's another screen shot just showing all 4 cores and utilization at the top:

Core 1 usually seems a couple degrees hotter than the other cores, but they all fluctuate as you can see, somewhat in sync with each other. Also the individual core temps are usually 1-5 degrees lower than the package temperature.

 

[popeyetyty]

What does it do when you stress test it for 20 minutes??

 

[Sisqo102]

Just ran a 20 minute stress test and it passed, it looks pretty much the same as above only stretched out for 20 minutes. Not increasing overall just fluctuating around the same numbers it seems.

 

[synphul]

Looks typical to me, cores tend to fluctuate some. It's not unusual to have 8-10c spread over the cores, aka one core at 64c with another at 56c, yours appear to be within 2-3c of each other. Core temps are what to watch rather than package temps.

For a steady state load you might try p95 v26.6 small fft's. Not all stress tests react the same, some fluctuate and it makes it difficult to keep temps steady for evaluation.

 

[Sisqo102]

I just want to add that I get this behavior when gaming as well (temps might be a little lower though), so I don't think it's just the one program causing the temperature fluctuations. I figured cores would fluctuate some, but by 20 C within seconds seemed like a little more than at least with my previous PC. However, if it's not an issue then it's not an issue and I will pick your solution soon for saying it's fine 😀

Thanks everyone for the responses.

 

[popeyetyty]

I just want to add that I get this behavior when gaming as well (temps might be a little lower though), so I don't think it's just the one program causing the temperature fluctuations. I figured cores would fluctuate some, but by 20 C within seconds seemed like a little more than at least with my previous PC. However, if it's not an issue then it's not an issue and I will pick your solution soon for saying it's fine 😀

Thanks everyone for the responses.

20 Degrees C is kind of a big drop/gain but 5-10 is around normal.

 

[synphul]

Temp fluctuations under load is normal. Starting a stress test on my 4690k I can go from 28c idle to 70c within a second or two. Then back down again when stopping the stress test. It doesn't take long to warm up or cool down, not like a big block of solid metal or anything.

 

[popeyetyty]

Temp fluctuations under load is normal. Starting a stress test on my 4690k I can go from 28c idle to 70c within a second or two. Then back down again when stopping the stress test. It doesn't take long to warm up or cool down, not like a big block of solid metal or anything.

Thats from idle to stress not idle-idle and idle being from 20-40-23-54-26 so on so forth.

 

[Sisqo102]

Ah, so maybe it is kind of a large amount to vary under load, could this point to a bad CPU or anything like that?

 

[popeyetyty]

Ah, so maybe it is kind of a large amount to vary under load, could this point to a bad CPU or anything like that?

Well what does it do while gaming? Is it the same, worse, more stable?? And what are max temp under stress test for 20 minutes??

 

[popeyetyty]

But to say something spiking 20 degrees is normal if the voltage is changing now if the voltage does not then that is a bit weird all my cpu's would spike a max of 6 degrees C without volt change now with a volt change it can go from idle of 30C to a load of 70-80C or gaming under 50-60C and that would also be normal and when i was saying a spike change of 20C is normal i was meaning from Idle-Gaming and not just Idle unless the voltage was changing even though it was in a idle load and that is caused by a setting in BIOS.

To sum it up. If the Idle voltage is changing constantly due to a saving's setting thing in bios that is normal but if the voltage was not changing at all and always the same that is a little weird that it changes so much in such little time. (Turbo Boost would cause it to change tamps a lot so if you got turbo boost enabled it is normal.)

So it boils down to if you got Turbo Boost enabled it is normal for it to fluctuate a lot cause turbo boost will allow the CPU to work at a much faster speed then the stock GHz so if you had a 2.0 GHz and turbo boost enabled it can go from 2.0-2.7 GHz and the 2.7 will give more heat than 2.0. in this case though it would be a higher clock speed of around 4 GHz to 4.2 or 4.4 GHz under Turbo. (Correct me if im wrong.)

 

[Sisqo102]

Okay here are the results for a 25 min stress test:

Max temps:

Package: 71 C
Core1: 71 C
Core2: 69 C
Core3: 61 C
Core4: 67C

Voltage: 1.354-1.375

Is that voltage fluctuation too much? I have it set at 1.35 in bios for turbo mode with adaptive voltage. Also at 4.5 GHz now.

Also I'm pretty sure that means turbo mode is enabled, but my core clock is always at 4.5.

Only other thing I notice here is core 3 significantly lower on the max temps. They are all still fluctuating, and the temperatures don't really seem any more stable while gaming, it's certainly not a straight line, but maybe doesn't fluctuate quite as much, will need to continue monitoring that. I understand idle to load spikes are normal, but I am getting load to load (I guess?) spikes of up to 20. If anything, my temperatures do not fluctuate if I leave my computer idle. But they will jump even at "somewhat idle" if I open up chrome or something. I thought that was normal, but the fluctuations during load seem weird, like it should be maxing at 70 or something and staying there.

 

[popeyetyty]

Okay here are the results for a 25 min stress test:

Max temps:

Package: 71 C
Core1: 71 C
Core2: 69 C
Core3: 61 C
Core4: 67C

Voltage: 1.354-1.375

Is that voltage fluctuation too much? I have it set at 1.35 in bios for turbo mode with adaptive voltage. Also at 4.5 GHz now.

Also I'm pretty sure that means turbo mode is enabled, but my core clock is always at 4.5.

Only other thing I notice here is core 3 significantly lower on the max temps. They are all still fluctuating, and the temperatures don't really seem any more stable while gaming, it's certainly not a straight line, but maybe doesn't fluctuate quite as much, will need to continue monitoring that. I understand idle to load spikes are normal, but I am getting load to load (I guess?) spikes of up to 20. If anything, my temperatures do not fluctuate if I leave my computer idle. But they will jump even at "somewhat idle" if I open up chrome or something. I thought that was normal, but the fluctuations during load seem weird, like it should be maxing at 70 or something and staying there.

So your CPU temp is 71 that is good, but if the CPU temp fluctuates around 15 degrees that can also be from the CPU going from 75 percent load to 20 percent load, so if things like that are happening like big load drops then thats what is causing the CPU to fluctuate a lot while gaming.

Now your CPU idle fluctuating that much idk because voltage going up like .25-.40 shouldn't change it up to 20 degrees maybe like 5 at most with my experience, but it is still normal to have a CPU temp to fluctuate due to the fact that it constantly has different amounts of stress every millisecond. What was the CPU percentage at was it a constant 100 like it is supposed to be??

 

[Sisqo102]

The CPU utilization actually ranges from 97-100 percent, and most often seems to sit at 99 percent (and 97 is rare) during the stress test. It changes pretty quick though between those numbers. Is this bad?

I know it should be maxing it but I guess I figured this was close enough, it's also shown as the top blue line in my pictures above. This is why I thought 20 C temperature changes for pretty much max utilization was kinda weird.

 

[Bakua]

Fluctuation with the 6700k (or any other CPUs) can be normal, but CPU spikes during idle from 28C-45C, I wouldn't even worry unless your CPU temps go past 70C.

 

[popeyetyty]

The CPU utilization actually ranges from 97-100 percent, and most often seems to sit at 99 percent (and 97 is rare) during the stress test. It changes pretty quick though between those numbers. Is this bad?

I know it should be maxing it but I guess I figured this was close enough, it's also shown as the top blue line in my pictures above. This is why I thought 20 C temperature changes for pretty much max utilization was kinda weird.

Well when stress testing 96-99 is kinda weird i never had a CPU do that on me my cpu's would stay at 100 percent and drop to 99 every hour then right back up to 100.