Fluctuating temps! Normal?

[dude98]

I am using a 4790K and a CM 212 EVO.

My CPU core temps are constantly fluctuating. For example, cores will go from 30C>33>40C>30C (same when idling in the 20's) all in a matter of a couple of seconds, or jump 10C or more in one second. Sometimes when opening a program, I've seen it jump 20C or more. This is using both HWMonitor and Real Temp, and these are idle temps.

The VID seems to fluctuate between 1.173, 1.226 and 1.279 quite a bit too.

Other than this, load temps seem good. Around 50C - 60C.

Is this normal?

 

[tambeshakunt]

Software temp monitors aren't really that accurate but still, it shouldn't fluctuate every second like you say.

Try measuring temps with Core temp. http://www.alcpu.com/CoreTemp/

Also, is your system free of dust? If not, grad a can of compressed air and blow it out.

 

[maestro0428]

I recommend Core Temp also. My cpu cores vary 2-4 C as I type right now. If you watch your task manager while also watching temps as you work, you can see the small jumps move with core use.

 

[dude98]

Software temp monitors aren't really that accurate but still, it shouldn't fluctuate every second like you say.

Try measuring temps with Core temp. http://www.alcpu.com/CoreTemp/

Also, is your system free of dust? If not, grad a can of compressed air and blow it out.

I recommend Core Temp also. My cpu cores vary 2-4 C as I type right now. If you watch your task manager while also watching temps as you work, you can see the small jumps move with core use.

--

I have core temp open, and temps seem a little more steady. I am still getting some odd jumps though.

Core #1 with a 5% usage spike (provided by Core Temp, 0% to 5%) went from 25C to 48C and then back to 25C in about a second. Core #0 did something similar, but with a 12% usage spike.


I'm also still seeing some jumps from, for example, 25C to 30C or even 25C to 34C sometimes, but it seems to mostly jump about 3C.

 

[dude98]

Double posted somehow.

 

[maestro0428]

What are you doing when it spikes. Is it just at idle? Even when using my web browser, I get spikes of 5% in temps while 10% spikes in usage come up. What is your fan on the cpu set to? A constant speed or fluctuating with the temps? I actually run mine at the same speed all of the time. That will cause larger spikes in temps, but I hate the ramping sound of the fans. Maybe your cpu fan is just not compensating enough. You could bump the speed up a bit in the BIoS or with Speedfan and I bet the temp fluctuations will be smaller.

 

[dude98]

What are you doing when it spikes. Is it just at idle? Even when using my web browser, I get spikes of 5% in temps while 10% spikes in usage come up. What is your fan on the cpu set to? A constant speed or fluctuating with the temps? I actually run mine at the same speed all of the time. That will cause larger spikes in temps, but I hate the ramping sound of the fans. Maybe your cpu fan is just not compensating enough. You could bump the speed up a bit in the BIoS or with Speedfan and I bet the temp fluctuations will be smaller.

The computer is at idle while this is happening. It seems it fluctuates about 3C most of the time but even a small usage spike can raise the temp of a core by 10C or more. I've tested it under load, and core #1 will go from the low 30's to the mid 50's quite often (and instantly) then go back down only to do it again a few seconds later. The usage spike was usually from 15% - 20% to 40% usage or so.

Fan speed is constant (about 700 RPM) and only changes when under load (e.g. gaming).

 

[maestro0428]

Speed up the fan to 1000rpms and see what happens then. I bet that will help a lot. Lemme know how that works.