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CPU Temp is low on idle but core temp is high

Discussion in 'Hardware' started by nexxev0, May 2, 2012.

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  1. nexxev0

    nexxev0 Thread Starter

    Joined:
    Jan 23, 2012
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    My CPU temp is sitting at 27 deg. Celsius.

    My Core temp is sitting at 57 deg. Celsius.

    These are my idle temps.

    The room is fairly cold.

    I have a large exhaust fan, 1 intake fan from the top, one intake fan from the side, and a stock heatsink / fan on my processor.

    I don't know what my base temps were before this started happening but under load my cpu comes up to about 45 - 55 and my core goes 75+.

    They system freezes up when it idles at 75 for too long.

    I tried cleaning off and replacing the thermal compound. Maybe needs more compound? But the CPU says that its cool....


    ANY IDEAS!?!?
     
  2. Tanis

    Tanis

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    Messages:
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    First Name:
    Shane
    To start with I would adjust your fan positions, based on what you have put above.

    Where is the 'large exhaust fan'?

    The '1 intake fan from the top' should be an exhaust really, the normal air intake fans are bottom front and on the side if fitted. Hot air rises so top fans should be exhausts. You also, ideally, want a higher volume of air being pushed in by the intake fans, than is being removed by the exhaust fans.

    I would suspect that is partly why your core temp is higher, the intake at the top is stopping hot air from getting out of the case which will increase the systems core temperature.

    Something like the diagram below is what you are looking for, with an addition side fan blow in if fitted:

    [​IMG]
     
  3. crjdriver

    crjdriver Moderator

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    First of all, what are you using to determine these temps; bios, software, what?
     
  4. nexxev0

    nexxev0 Thread Starter

    Joined:
    Jan 23, 2012
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    Thanks for your replies

    crjdriver:
    I am using speed fan (more for fan control than temp) and coretemp. They both seem to be reporting the same core temps

    tanis:
    I will swap some fans around tonight per your suggestion. I see why that would cause a problem. Also I was able to get my temps to 68 and under by taking off my side panel behind the motherboard and put a small desk fan blowing into the case at an angle.

    To answer your question about the large exhaust fan i believe that it is an 80mm fan it is located on the back side of the computer (where the IO ports are). I will change the top of the case fan to be an exhaust fan. I do have a side case fan blowing in and I have my CPU fan blowing on the processor. I don't believe that I have any blowing from the front of the case to the back. I will see if I can dig some more fans up.
     
  5. crjdriver

    crjdriver Moderator

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    Both coretemp and speedfan can return flaky info. Check your temps either in the bios or with the board maker's monitoring software. Most board makers have software available for download to monitor temps, voltages, fan speeds, etc. If you have an asus, gigabyte, foxconn, or intel board, I know they have monitoring software.
     
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