Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: CPU fan running fast

18 Apr 2012   #1
ICIT2LOL

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
 
 
CPU fan running fast

I swapped out a CPU in an old machine (XP) today and on starting the machine the CPU fan kept running at full speed.


I swapped the CPU (Pentium 4 @ 3.2Ghz) again with another known good one (Pentium 4 @ 3.0Ghz only difference is the L2 cache size) to check if the CPU was the problem but it still runs at full speed. The heatsink itself is almost stone cold even after half an hour's running.
I used fresh thermal compound each time (Noctua HT-N1) after thoroughly cleaning / preparing the two surfaces.


I have Googled to see if the fan itself could be at fault but cannot find anything related to it.


Have also checked the BIOS and the fan speed is enabled by which I take it that it will run at whatever speed is necessary for the CPU temperature?


So unless the fan itself has a controller / sensor (Intel) I don't know what to check next apart from finding another fan to put onto the heatsink.

Does anyone know of a check I can do with a multimeter or an app for instance on the fan to check it's operation?

Meant to mention the board is a Intel 915GAV.
My System SpecsSystem Spec
18 Apr 2012   #2
windude99

Windows 7 Professional x64 Service Pack 1
 
 

Quote   Quote: Originally Posted by ICit2lol View Post
I swapped out a CPU in an old machine (XP) today and on starting the machine the CPU fan kept running at full speed.


I swapped the CPU (Pentium 4 @ 3.2Ghz) again with another known good one (Pentium 4 @ 3.0Ghz only difference is the L2 cache size) to check if the CPU was the problem but it still runs at full speed. The heatsink itself is almost stone cold even after half an hour's running.
I used fresh thermal compound each time (Noctua HT-N1) after thoroughly cleaning / preparing the two surfaces.


I have Googled to see if the fan itself could be at fault but cannot find anything related to it.


Have also checked the BIOS and the fan speed is enabled by which I take it that it will run at whatever speed is necessary for the CPU temperature?


So unless the fan itself has a controller / sensor (Intel) I don't know what to check next apart from finding another fan to put onto the heatsink.

Does anyone know of a check I can do with a multimeter or an app for instance on the fan to check it's operation?

Meant to mention the board is a Intel 915GAV.
Have you tried putting the old cpu back in to see if the fan runs at full speed?
My System SpecsSystem Spec
18 Apr 2012   #3
Dwarf

Windows 8.1 Pro RTM x64
 
 

How many leads does the fan connector have? AFAIK, only those with 4 leads are able to vary their speed using PWM (Pulse Width Modulation). This signal is available on the 4th pin, the other 3 being Ground, +12V, and RPM output.
My System SpecsSystem Spec
.

18 Apr 2012   #4
Duzzy

Windows 7 Ultimate x64
 
 

If the fan connector is a 3 pin and if it will reach try connecting it to the fan connector above the PCI-E slot.

The heatsink may be cool but that isn't what controls the speed. What is the CPU temp?

Quote:
fan speed is enabled
Does this say enabled or just shows the fans RPM?

Do you have these options?
Quote:
1. CPU Fan Control: Enabled
2. Fan Control: Enabled
3. Lowest fan speed: Slow
Don't know if this is your problem - Desktop Boards - Thermal zone information
Quote:
Previously, certain processors' thermal values were not available to the BIOS so the BIOS was unable to perform the appropriate fan control (the fans ran at 100% constantly). With recent BIOS updates, the thermal values are available and the BIOS will run the appropriate fan control.
With the risk of killing the motherboard I would not attempt to update the BIOS until you have exhausted all other options.
My System SpecsSystem Spec
18 Apr 2012   #5
ICIT2LOL

Desk1 7 Home Prem / Desk2 10 Pro / Main lap Asus ROG 10 Pro 2 laptop Toshiba 7 Pro Asus P2520 7 & 10
 
 

Yep the fan/s (have tried an exact same cooler unit) have four leads both genuine Intel.

Yep have tried the original CPU back in.

The BIOS only shows me CPU fan control [enabled] / fan control > [enabled] / Lowest fan Speed [Slow]

Processor zone 56C
Processor fan speed 2756rpm > original cooler unit

Processor zone 60C
Processor fan speed 2056rpm > other cooler unit

Now the thing boots and runs real quick for an older machine and there is no problem with running apps etc The only thing is that the CPU fan runs flat out and is kind of really noisy.

Am just wondering if I should reset the BIOS by jumping it or taking the battery out or just picking default settings.

Maybe I have two dud CPU's?
My System SpecsSystem Spec
Reply

Thread Tools


Similar help and support threads
Thread Forum
Laptop BIOS clock running really fast
Hi, Recently I noticed that the clock on my laptop was incorrect. I changed it within Windows several times but it kept going wrong again the next day. I decided to check the clock in the BIOS set up menu and it turns out that the clock is running really fast. I'd say it takes about a second...
Hardware & Devices
Windows Update not running. Error Code 0xc8000247 when running SURT
Please help me out - I replaced my defective HDD with a new Samsung Spinpoint HDD, re-installed my Windows 7 image using the recovery DVDs, and can't update windows at all after that. I tried following the steps from Windows Update Posting Instructions - System Update Readiness Tool (SURT) and...
Windows Updates & Activation
Running dual Boot w/ Vista and Win 7, question on running programs
Greetings, New to the forum! I recently installed Win 7 on a second Hard drive. Is it possible to run the programs I had installed on the Vista Hard drive? Both are HD's are still installed. Thanks, Brad
General Discussion
BSOD running when running intel driver update utility and more apps
hello sorry if my post isnt great im a newbie here but for some time now ive been getting BSODs and finally figured out how to debug it with WinDbg (x86) and set the symbols for windows but i cant read the text. ive tried reinstalling my GPU and Java but no luck. when i try to run intel driver...
BSOD Help and Support
Changed CPU, now my fan is running fast and loud
I have a Gateway GM5632e desktop. I replaced the Q6600 to a Q9650 CPU and now my heatsink and fan is running super fast and loud even though the temps stay in the 40 degree range. I checked into the BIOS and I'm not seeing anything to change it besides a few very unclear options that I've tried...
Hardware & Devices
Desktop wifi slow.Wired desktop Fast.Laptop wifi fast.
Just boosted my ISP BBand speed from 10MB to 30MB... the wired pc and the wifi laptop have shown great improvement (approx 40MB), however the wifi desktop is still slow. I have replaced the adapter to a new up-to-date one, (USB) and alothough it is showing small improvement it is still restricting...
Network & Sharing


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 13:21.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App