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Windows 7: cpu fan rpm slowly gets higher and higher

01 Apr 2013   #1
jian57

windows 7
 
 
cpu fan rpm slowly gets higher and higher

This has been happening for around 3 days. When I start the computer (desktop) up, the rpm is normal but it slowly starts to speed up. After around 5 minutes, the fan starts moving at a average of 4000rpm and it's really starting to worry me.
I thought it might have been something to do with dust inside the heatsink so I cleaned the dust with a vaccum cleaner. After that, it still wouldn't slow down so I changed the thermal paste. It now slows down a bit but still run at the average of 4000rpm.
I also tweaked with the bios a bit but still no luck.
Help?


My System SpecsSystem Spec
.
01 Apr 2013   #2
marsmimar

Microsoft Community Contributor Award Recipient

 
 

Have you checked actual temperatures to see if there's a corresponding rise with increased fan rpm? Couple of free utilities:

Speccy - System Information - Free Download

SpeedFan - Access temperature sensor in your computer

HWMonitor - CPUID - System & hardware benchmark, monitoring, reporting
My System SpecsSystem Spec
01 Apr 2013   #3
jian57

windows 7
 
 

yes, I have. And there seems to be a corresponding rise with the fan rpm.
My System SpecsSystem Spec
.

01 Apr 2013   #4
Layback Bear

Windows 7 Pro. 64/SP-1
 
 

Filling in your specs would help us help you.

System Info - See Your System Specs
My System SpecsSystem Spec
01 Apr 2013   #5
windude99

Windows 7 Professional x64 Service Pack 1
 
 

When was the last time you cleaned your computer with compressed air?
My System SpecsSystem Spec
02 Apr 2013   #6
DavidE

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64
 
 

Quote   Quote: Originally Posted by jian57 View Post
yes, I have. And there seems to be a corresponding rise with the fan rpm.
If your fan speed is increasing with a corresponding increase in CPU temp, that is normal and good.
The "system" is trying to keep the CPU temp down so it won't overheat.

If you have cleaned everything, and made sure ALL FANS are working OK, check Task Manager to see if you have something running that is using a lot of CPU.

Start Task Manager (Right click on the taskbar)
- click the "Show processes from all users"
- click the "CPU" heading so the highest numbers are sorted to the top of the list

Post a screen print of what you see when the fan is running fast.
Screenshots and Files - Upload and Post in Seven Forums

Here is an example showing 92% CPU usage for "System Idle Process".

Name:  TMUSP01.PNG
Views: 4
Size:  43.7 KB


My System SpecsSystem Spec
02 Apr 2013   #7
jian57

windows 7
 
 

Quote   Quote: Originally Posted by windude99 View Post
When was the last time you cleaned your computer with compressed air?
I cleaned it just a few days ago.

Quote   Quote: Originally Posted by DavidW7ncus View Post
Quote   Quote: Originally Posted by jian57 View Post
yes, I have. And there seems to be a corresponding rise with the fan rpm.
If your fan speed is increasing with a corresponding increase in CPU temp, that is normal and good.
The "system" is trying to keep the CPU temp down so it won't overheat.

If you have cleaned everything, and made sure ALL FANS are working OK, check Task Manager to see if you have something running that is using a lot of CPU.

Start Task Manager (Right click on the taskbar)
- click the "Show processes from all users"
- click the "CPU" heading so the highest numbers are sorted to the top of the list

Post a screen print of what you see when the fan is running fast.
Screenshots and Files - Upload and Post in Seven Forums

Here is an example showing 92% CPU usage for "System Idle Process".

Attachment 262300
Here is the screenshot:


And I will fill in my specs later.
My System SpecsSystem Spec
03 Apr 2013   #8
DavidE

Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64
 
 

88% CPU usage for System Idle process should not be a problem that would cause overheating.
If you keep Task Manager open, does the fan speed and CPU temp decrease?
There is some malware that hides itself when Task Manager is opened so the user doesn't see it, and CPU usage looks OK...
My System SpecsSystem Spec
03 Apr 2013   #9
jian57

windows 7
 
 

No, the fan doesn't decrease. It runs normally.
My System SpecsSystem Spec
Reply

 cpu fan rpm slowly gets higher and higher




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