# Thermal throttling and fan speed

**URL:** <https://forums.developer.nvidia.com/t/thermal-throttling-and-fan-speed/110212>\
**Category:** Linux\
**Created:** [January 9, 2020, 4:38pm UTC](https://forums.developer.nvidia.com/t/thermal-throttling-and-fan-speed/110212 "2020-01-09T16:38:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![brettwrbwt](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@brettwrbwt](https://forums.developer.nvidia.com/u/brettwrbwt)\
**Post date:** [January 9, 2020, 4:38pm UTC](https://forums.developer.nvidia.com/t/thermal-throttling-and-fan-speed/110212/1 "2020-01-09T16:38:20Z")

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I am running CUDA applications on a P4000 GPU. I noticed that the temperature is getting up to 82C, but the fan never goes above 63%. I dug a little further and found that the clock speeds are being reduced when this happens. I checked the throttle reason, and it is set to 0x20 (SW Thermal Slowdown).

My question:  
If the device is throttling due to temperature, why doesn’t the fan speed increase to more than 63%?

Thanks!  
Brett

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<div class="post-metadata">

**Author:** ![brettwrbwt](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@brettwrbwt](https://forums.developer.nvidia.com/u/brettwrbwt)\
**Post date:** [January 23, 2020, 9:15pm UTC](https://forums.developer.nvidia.com/t/thermal-throttling-and-fan-speed/110212/2 "2020-01-23T21:15:52Z")

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No one?

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**Author:** ![generix](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/generix/32/16024_2.png) [@generix](https://forums.developer.nvidia.com/u/generix)\
**Post date:** [January 28, 2020, 10:05am UTC](https://forums.developer.nvidia.com/t/thermal-throttling-and-fan-speed/110212/3 "2020-01-28T10:05:13Z")

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The fan curve is defined in the VBIOS of the card. So it’s a bit odd it doesn’t throttle up more than 63%. So you might want to check for a VBIOS update from the manufacturer of the card.  
Otherwise, you would have to use Coolbits and manually set the fan speed to 100%:  
[https://download.nvidia.com/XFree86/Linux-x86\_64/384.98/README/xconfigoptions.html](https://download.nvidia.com/XFree86/Linux-x86_64/384.98/README/xconfigoptions.html)