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CPU Fan I recently upgraded my processor from a AMD Athlon II X2 220 to a Phenom X4 840. For some reason the CPU fan will come on and shut off a few times within a minute. Can anyone give me a few suggestions on what can be causing this problem ?????

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  • bjones8205 Mar 29, 2014

    Thanks for your help. I was getting a false reading for my TMPIN2. When I changed the processor I applied new thermal paste to the new one. I guess I have to upgrade my fins and fan.

  • Paul Smith Mar 29, 2014

    My pleasure. Happy computing. :D



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When it comes to computers and changes in system heat, the very first thing I always tell folks is to clean your computer. Dust is one of the best insulators out there so get the dust out, drop the computer's running temperature. (Oh.. and please don't use a regular vacuum cleaner unless you like dead motherboards!!)

I've come across this fan issue a couple of times now. Barring a dusty computer, it's most likely that your new hotter system is running at the same temperature as the fan setting on your motherboard. The X4 Phenom runs hotter than the X2 220 by only a slight margin but that's all it takes. I'm assuming you're comparing these at default speeds as when you overclock, your base temperatures all go out the window.

There are two solutions to this, up the temperature range of your fans or cool down your system. If your system is already running at 50C or hotter, you'll need to look at some combination of reducing internal clutter (blocks or diverts air flow), getting higher CFM fans (though not necessarily noisier.. there's some quiet fans out there), or even changing your case for one that pushes high air flow.

If your system is already running sufficiently cool, your may simply want to increase the fan temperature value in the BIOS/UEFI.

There's a bunch of good freeware tools out there to monitor your system temperatures like HWMonitor or AIDA64.

Hope this helps some.

Posted on Mar 24, 2014

  • 5 more comments 
  • bjones8205 Mar 26, 2014

    From the CPU section in HWMonitor I am getting between a 52 - 61 degrees C. And my TMPIN2 is reading a 128 degrees C. Is this normal?

  • Paul Smith Mar 26, 2014

    No.. your TMPIN2 (likely your northbridge chip) is either running incredibly hot or you may be getting a bad value from either the software or your motherboard. Please re-test the values with a different software like RealTemp to see if your software is misinterpreting the value. If you could let us know what motherboard you are using, that would be very helpful.

  • bjones8205 Mar 26, 2014

    Ok. Iam using a DA061L-3D m/b

  • Paul Smith Mar 27, 2014

    OK.. This is an Acer board from pre 2006 so we're talking about

  • Paul Smith Mar 27, 2014

    some pretty old thermal compound. You might consider pulling the finned heatsink off and redoing the thermal compound... possibly even changing the fins out for fins and a fan... Zamlan has come pretty nice quiet chipset fans..

  • Paul Smith Mar 27, 2014

    and (sorry for the broken message.. arrgghh!!) do the same for your main CPU as well. See what that changes... you might be pleasantly surprised. Nice upgrade btw!!

  • bjones8205 Mar 29, 2014

    Thanks for you help. I was getting a false reading for the TMPIN2. When I changed the processor, I also applied thermal paste to the new processor. I'm guess I have to upgrade my fins and fan.



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