Fluctuations in the CPU temperature and Fan speed

[mpadhu]

Hi All,

I have noticed this weird behavior of the CPU recently. The CPU temp raises and falls frequently and in turn makes fan to spin faster. I found this by hearing the CPU fan making noise in regular intervals. Moreover the strange thing is that this happens when none of the applications are in use.
At first, I was browsing thru Chrome browser and noticed this fluctuations and then I closed all apps and found the same thing. I restarted the PC and surprisingly found the same.

I monitored the readings using the app provided by the Gigabyte along with Motherboard purchase.
The major parts of my specs are as follows. Did not do any overcloking.
AMD A10-7850K APU
Gigabyte F2A88XM-D3H mobo
8GB Kingston fury RAM
Windows 7 OS

I am attaching the CPU temperature and Fan speed graphs for better understanding.
Please give your suggestions. Please click below hyperlinks.


Temperature graph
Fan RPM

 

[JackNaylorPE]

You may not be using any applications actively but that doesn't mean your OS or programs aren't doing anything on their own. Open task manager and see that whole list of stuff on your processes tabs... all those things are running. Click the header in the CPU column and it will rank them by which is using the most CPU cycles.

Use your MoBos fan control utility to control the fans..... from the looks of your graphs, the fan curve is poorly matched to system loads. Budget boards may not have the sophistication in their utilities to manage this well. The better utilities allow you for example to ramp up and down in response to temps and this eliminates rthe cycling you see.

Another problem is inadequate case cooling. If you don't move the hot air out of the case, then it will stagnate at the top ... the CPU fans may speed u and move it around, but once the clear it and slow town, the same thing happens/, You want one 120mm fan for each 50-75 watts of rated load.

 

[spoofer2]

do you have antivirus software? there is a well known virus that causes this. also check to see if any processes are running in the background such as a virus scan or disk defragmentation. if not then it may be a hardware issue. do you have a stock cpu cooler? if so you might try replacing it with another stock or aftermarket cooler. i would also make sure your bios is up to date.

 

[mpadhu]

You may not be using any applications actively but that doesn't mean your OS or programs aren't doing anything on their own. Open task manager and see that whole list of stuff on your processes tabs... all those things are running. Click the header in the CPU column and it will rank them by which is using the most CPU cycles.

Use your MoBos fan control utility to control the fans..... from the looks of your graphs, the fan curve is poorly matched to system loads. Budget boards may not have the sophistication in their utilities to manage this well. The better utilities allow you for example to ramp up and down in response to temps and this eliminates rthe cycling you see.

Another problem is inadequate case cooling. If you don't move the hot air out of the case, then it will stagnate at the top ... the CPU fans may speed u and move it around, but once the clear it and slow town, the same thing happens/, You want one 120mm fan for each 50-75 watts of rated load.

do you have antivirus software? there is a well known virus that causes this. also check to see if any processes are running in the background such as a virus scan or disk defragmentation. if not then it may be a hardware issue. do you have a stock cpu cooler? if so you might try replacing it with another stock or aftermarket cooler. i would also make sure your bios is up to date.

Thanks so much for your responses.
I already have a 120mm fan at front and 80mm fan at rear. I noticed that this fluctuation happens only in windows 7 but not on windows 10.(I have dual booted). I suspect the software from Gigabyte is creating the issue. Let me try with AMD overdrive on both Win 7 and 10.

I have recently seen a cooler while browsing. Please let me know if this is Good for FM2+. Below is the hyperlink.

DEEPCOOL ICE EDGE MINI FS DUAL BLADES