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CPU Kernel Temperature

Discussion in 'Hardware' started by itbookham, Dec 12, 2007.

  1. itbookham

    itbookham Nibble Poster

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    Hi,

    I have a Aopen MK77M-8XN motherboard, an AMD Athlon XP 2000, 512MBS RAM, two IDE HDDs. The system has a PSU and CPU fan.

    The software program HMonitor is returning the following parameters:

    Motherboard 48oC
    CPU1 43oC
    Temp3 95oC (highlighted in red)
    HDD Temperatures 49oC
    Cooling fans – Chassis 3668 RPM

    What is Temp3 referring to? At this temperature (95oC), something is melting? Is this a spurious message or is it the CPU kernel temperature? I have checked in BIOS 'Silent BIOS/HW Monitor' and this shows the CPU Kernel temperature at 95oC. Is this a normal temperature?

    Also for no apparent reason when running in Windows XP for about 20 minutes, the screen disappeared and nothing was displayed on the monitor. The Shutdown temperature in BIOS shows 70oC. Does this refer to the CPU Kernel temperature?

    Any thoughts will be appreciated.
     
    WIP: A+
  2. BosonMichael
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    BosonMichael Yottabyte Poster

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    Holy crap! :ohmy 95C is awfully high... past shutdown for most chips. If that's indeed the kernel temp, that's not good. Not sure why your other CPU reading would be in the 40s... hmm.
     
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  3. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    That is very high mate.

    How many fans do you have inside your case?

    and how many can you have?

    I had a similar problem with my graphics card when I first joined CF as my card uses passive cooling and my case is not very well ventilated I was getting GPU temp readings of 95 and the obvious shutdown because of it, I added more cooling fans to my pc, and now my GPU never gets pass 68 on full load and my cpu 40C
     
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  4. itbookham

    itbookham Nibble Poster

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    Would removing the CPU fan, cleaning and reapplying thermal paste possibly be a solution?

    I suppose if HMonitor and the BIOS readings are showing a CPU Kernel temperature of 95oC, then this is probably correct? If so, probably a new CPU and or fan?
     
    WIP: A+
  5. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    Read my post above, try getting some added cooling fans before removing cpu and reapplying paste.
     
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  6. itbookham

    itbookham Nibble Poster

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    Would removing the CPU fan, cleaning and reapplying thermal paste possibly be a solution?

    I suppose if HMonitor and the BIOS readings are showing a CPU Kernel temperature of 95oC, then this is probably correct? If so, probably a new CPU and or fan? Also at these temperatures, could the integrity of the motherboard be compromised?
     
    WIP: A+
  7. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    if you only have a cpu fan and no other fans then this is likley your issue, you need to remember that just because your cpu has a heatsink and fan there is still heat there, if you add more fans this will allow the heat to be dispearsed more quickly on also dramatically improve the cpu temperature.

    My computer was the same just a cpufan no other cooling, no wonder it was getting hot :blink
     
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  8. itbookham

    itbookham Nibble Poster

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    Yeah, a case fan would be a sensible option.
     
    WIP: A+
  9. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    try doing that first before replacing the cpu fan and heatsink, I also have an exhaust port fan which blows the hot air out any getting passed that gets taken out by the case fan.
     
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  10. rax

    rax Megabyte Poster

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    I would also check that your CPU fan, PSU fan and graphics card fan aren't clogged with dust. Temp3 is odd because it isn't stating what exactly is at that temperature. I would check for dust in any case, the PSU may be un-doable though, but the other 2 are fine to check yourself.

    Failing that, I'd go for extra fans because it will improve your temperatures either way. If that fails to work, try re-applying the thermal paste on the heatsink.. and if THAT doesn't work, try buying a new heatsink..

    Dave
     
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  11. greenbrucelee
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    greenbrucelee Zettabyte Poster

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    yes this would also be a good idea, get some air in a can if you can :biggrin
     
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  12. itbookham

    itbookham Nibble Poster

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    Thanks guys. I will look into installing a new case fan, cleaning out any dust and if necessary cleaning the fan and heatsink. The only thing that occurs to me is finding the connector on the motherboard that takes the case fan connector. Is there a website which specialises in motherboard books. I have checked the web for this particular motherboard, but to no avail.
     
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  13. rax

    rax Megabyte Poster

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  14. greenbrucelee
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    if you do not have a mobo manual and cant find an online version by visiting the mobo manufacturers website get a torch and shine it on the mobo you will see writing that explains where components can connect, your chasis fan connector may be near the hard drive connectors. The board will have atleast one chasis fan connector and cpu fan connector.

    As Dave says there will be some hanging from the PSU.
     
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  15. Mathematix

    Mathematix Megabyte Poster

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    I'm surprised that no-one mentioned ensuring that the heatsink is securely and evenly placed over the CPU when fitted after applying the thermal paste. This is a major culprit for rapid overheating of the CPU. Also graphics card processors (GPUs) can get very hot for the same reasons.
     
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  16. rax

    rax Megabyte Poster

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    I think we kind of covered that from re-applying the thermal paste. In order to do this successfully he would need to re-seat the heatsink anyway and thus, he would be checking it is indeed seated correctly. As for checking with precision, if he doesn't know to do it himself, I'm going to guess he wouldn't know what to look for anyway, at least not without a manual.
     
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  17. Mathematix

    Mathematix Megabyte Poster

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    Nope, applying thermal paste is applying thermal paste, and reseating the heatsink is reseating the heatsink.

    Beyond ensuring that there are no 'bubbles' when applying the thermal paste, when fixing the heatsink you should ensure that it is securely fastened at all four points; none should be loose.
     
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  18. BosonMichael
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    Next time I apply thermal paste, I'll try to do it without removing that pesky heatsink. 8) Thanks for the suggestion! :thumbleft
     
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  19. TimoftheC

    TimoftheC Kilobyte Poster

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    I would agree with the many tips above about cleaning the system and about getting good fans in to the system.

    I would also go one step further and say give the entire system a very thorough dust cleaning - that includes finding out where the vent holes are and making sure they are clear.

    Most towers have a detachable plastic front that often hide vents to the front of the computer - make sure you can get access to those and clean them as well. Also, take off both sides of the case and clean them, not just the side that gives access to the computer innards - there are vents at the bak of the mobo that should be cleared.

    If your are still having heat problems after all this it might be an idea to see if you can get a more specialised heat sink and fan set-up as I find most of those supplied by the cpu manufacturer are often only just up to the job.
     
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  20. itbookham

    itbookham Nibble Poster

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    Many thanks for all this useful advice. I wonder what approx. power is required by a new case fan? I only hope the PSU wattage is sufficient to accomodate it?
     
    WIP: A+

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