[SOLVED] CPU at 100° Celsius, please Help!

Comments

• Paintbox Posts: 1,633

  September 2018

  Just disable the CPU as a rendering device. Go to render settings -> advanced and disable any CPU checkmarks. The CPU doesn’t contribute a lot anyway.
• SixDs Posts: 2,384

  September 2018 edited September 2018

  There are several reasons why any component might be overheating, including:

  1. Ambient temperature - i.e. the room temperature in which the computer is being used. The effectiveness of any type of cooling solution depends upon a significant difference between the ambient temperature and the component. The greater that difference, the better. Running a computer full tilt in a hot room is going to result in higher component temperatures.

  2. For air cooled components, ventilation and air circulation within the computer enclosure can have a significant impact. Laptops are notoriously bad in this respect as so much technology is crammed into such a confined space. There should be both an adequate intake/inflow of cool ambient air as well as an adequate exhaust of heated air. The relatively unimpeded flow of air from intake to exhaust and over the heat-generating components is also important.

  3. Efficiency/effectiveness of the cooling solutions employed on the components. Whether using air cooling or liquid cooling, not all are created equal - some are better than others. When it comes to CPU's, the stock coolers that often come with the processors are usually adequate for most everyday use, but may fall short when it comes to running the processors full speed for extended periods. A better aftermarket cooling solution can make a big difference. Having said that, some of the better air cooled aftermarket solutions are quite large (and not cheap, either). If cramped for space, a water cooled solution may be the answer, since the bulky radiators and fans tend to be mounted externally.

  4. A dirty PC. In most environments, dust will tend to accumulate over time on both components and cooling equipment. In exceptionally dusty environments the problem is exacerbated. Dust will act as an insulator, interferring with heat exchange and cooling. Cleaning your computer periodically can help.

  5. Cooling compoent failure. Fans wear out. Thermal compound can dry out and become less effective at transferring heat. Monitoring your cooling solutions to ensure that they are functioning correctly is important, even for components that use thermal throttling.

  Or some combination of the foregoing.

  So, to keep your PC running cool, ensure that you run it in a relatively cool environment, ensure that it uses a case/enclosure with adequate ventilation and airflow, keep it clean and ensure that your cooling components are functioning correctly. Still have problems? Explore more efficient/effective cooling solutions: water cooling, better heatsinks and fans, etc. Additionally, configure fan profiles if possible. The latter refers to setting fan speeds to increase with increased component temperatures. This may or may not require the installation of software to do so, such as Speedfan or MSI Afterburner. An increase in fan speed may be sufficient to drop temperatures to more acceptable levels.

  Of course, if we are talking laptop, your options are extremely limited. The compromises made for the sake of style and portability can often be responsible for cooling issues due to little provision for ventilation. The options for addressing such issues in laptops range from limited to non-existent.

  Post edited by SixDs on September 2018
• yonatancicha Posts: 0

  September 2018

  Paintbox said:

  Just disable the CPU as a rendering device. Go to render settings -> advanced and disable any CPU checkmarks. The CPU doesn’t contribute a lot anyway.

  Thanks! It worked, Now it's around 70°C~80°C amd my GPU is working at 42°C, so it's good now, thanks!
• yonatancicha Posts: 0

  September 2018

  SixDs said:

  There are several reasons why any component might be overheating, including:

  1. Ambient temperature - i.e. the room temperature in which the computer is being used. The effectiveness of any type of cooling solution depends upon a significant difference between the ambient temperature and the component. The greater that difference, the better. Running a computer full tilt in a hot room is going to result in higher component temperatures.

  2. For air cooled components, ventilation and air circulation within the computer enclosure can have a significant impact. Laptops are notoriously bad in this respect as so much technology is crammed into such a confined space. There should be both an adequate intake/inflow of cool ambient air as well as an adequate exhaust of heated air. The relatively unimpeded flow of air from intake to exhaust and over the heat-generating components is also important.

  3. Efficiency/effectiveness of the cooling solutions employed on the components. Whether using air cooling or liquid cooling, not all are created equal - some are better than others. When it comes to CPU's, the stock coolers that often come with the processors are usually adequate for most everyday use, but may fall short when it comes to running the processors full speed for extended periods. A better aftermarket cooling solution can make a big difference. Having said that, some of the better air cooled aftermarket solutions are quite large (and not cheap, either). If cramped for space, a water cooled solution may be the answer, since the bulky radiators and fans tend to be mounted externally.

  4. A dirty PC. In most environments, dust will tend to accumulate over time on both components and cooling equipment. In exceptionally dusty environments the problem is exacerbated. Dust will act as an insulator, interferring with heat exchange and cooling. Cleaning your computer periodically can help.

  5. Cooling compoent failure. Fans wear out. Thermal compound can dry out and become less effective at transferring heat. Monitoring your cooling solutions to ensure that they are functioning correctly is important, even for components that use thermal throttling.

  Or some combination of the foregoing.

  So, to keep your PC running cool, ensure that you run it in a relatively cool environment, ensure that it uses a case/enclosure with adequate ventilation and airflow, keep it clean and ensure that your cooling components are functioning correctly. Still have problems? Explore more efficient/effective cooling solutions: water cooling, better heatsinks and fans, etc. Additionally, configure fan profiles if possible. The latter refers to setting fan speeds to increase with increased component temperatures. This may or may not require the installation of software to do so, such as Speedfan or MSI Afterburner. An increase in fan speed may be sufficient to drop temperatures to more acceptable levels.

  Of course, if we are talking laptop, your options are extremely limited. The compromises made for the sake of style and portability can often be responsible for cooling issues due to little provision for ventilation. The options for addressing such issues in laptops range from limited to non-existent.

  Thanks for your advice, but when I'm playing games with graphics set at Ultra, the CPU is at about 70°C~80°C So I think it's well cooled and clean
• ebergerly Posts: 3,255

  September 2018 edited September 2018

  Turning off the CPU doesn't solve the issue that it shouldn't be getting up to 100C in the first place. It should automatically throttle and crank up the fans before that, or possibly even shut down. Sounds like there's an issue there. You might want to follow SixD's excellent advice and make sure there's nothing else going on.

  Post edited by ebergerly on September 2018
• TheKD Posts: 2,711

  September 2018

  First thing I would check is the compound that attaches the fan to the CPU. If you don't know how to check it, take it to someone that does. It will be a lot cheaper than having to replace the CPU and mobo if it burns out.
• ebergerly Posts: 3,255

  September 2018

  Yeah, the strange thing is both CPU's on two different machines are getting up in the 95-100C range. Weird. Makes me wonder if maybe they're both tucked away in an enclosed area where the cooling can't work real well, even if the fans respond and/or the CPU throttles. Or maybe some major dust bunnies?

  But anyway, I'd really check into why the temps are so high. If it doesn't happen with rendering it might happen with the next app that comes along.

  But just turning off the CPU while rendering is like saying "hey, I noticed when I'm driving 70mph on the highway my car has steam spewing out from under the hood and smoke coming out the tailpipe". 

  And the response "Oh, well don't drive fast on the freeway, just drive 20mph everywhere" 

  Well, yeah, but it's probably better to check under the hood to see why there's a coolant leak that's causing the engine to overheat .