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Support

Cooling and Fan Controls


Last Reviewed: 29-Jun-2016
Article ID: 000005946

This document provides information on cooling and fan control options in BIOS Setup for Intel® NUC products. To view system fan control settings:

  1. During boot, enter the BIOS Setup by pressing F2.
  2. Select Advanced Setup > Cooling.
  3. Press F10 to exit.

D33217GKE/DC3217IYE, D33217CK/DC3217BY, DCP847SKE/DCCP847DYE, D53427RKE/DC53427HYE
These Intel® NUCs have a thermal diode on the processor side, or top side, of the board that is monitored to control the fan speed. The D53427RKE/DC53427HYE has a second thermal diode on the connector side, or bottom side, of the board as well. System fan control settings in BIOS setup can be changed to meet the needs of your system usage model.

Definitions:

 
Option Description
Minimum Temperature (°C) Fan speed increases if the processor temperature exceeds this value. The value is calculated by Tcontrol minus a fixed value.
Minimum Duty cycle (%) This parameter specifies the minimum duty cycle that will be output to the fan.
Duty cycle increment (%/°C) Fan speed increases by this percentage for each degree over the minimum temperature.
Fixed Allows the fan speed to be set at a fixed speed and never change. Options are from 20 to 100 percent in 10 percent increments.
Custom Allows the fan speed to be customized based on processor temperature, minimum duty cycle, and duty cycle increment. Each value can be user-configured.
Cool A preset configuration that is set to keep the overall system cooler, but slightly louder by utilizing a temperature range 16 degrees wide.
Balanced A preset configuration that is set to keep the overall system balanced between cool and quiet by utilizing a temperature range 10 degrees wide.
Quiet A preset configuration that is set to keep the overall system quieter, but slightly warmer by utilizing a temperature range 6 degrees wide.
 

These Intel NUCs include preset configurations in the BIOS with the following default values:

 
Option Cool Balanced Quiet
Minimum Temperature (°C) Tcontrol - value Tcontrol - value Tcontrol - value
Minimum Duty Cycle (%) 30 30 30
Duty Cycle Increment (%/°C) 5 8 13
 

D34010WYB/D34010WYK, D54250WYB/D54250WYK
These Intel® NUCs have a single fan that is used to manage the temperatures of its various components. Two different temperature input choices for monitoring temperatures are available: a primary temperature input and a secondary temperature input.

Definitions:

 
Option Description
Fan Usage This parameter is always set for System fan control and there are no other options.
Control Mode This parameter specifies whether the fan will be controlled automatically or manually. In
Automatic (Auto) control mode, the fan speed will vary automatically based upon thermal conditions and configuration. The Minimum Duty Cycle, Maximum Duty Cycle, Primary Temperature Input and Secondary Temperature Input parameters are used to specify the configuration for this mode. In Manual control mode, the fan spins at a fixed speed. The Manual Duty Cycle parameter is used to control this.
Duty cycle increment (%/°C) Fan speed increases by this percentage for each degree over the minimum temperature.
Manual Duty Cycle (%) This parameter is only visible when the Control Mode is set to Manual. It specifies the duty cycle that the temperature is to operate at. Warning: while configured for manual control, no circumstance will result in this manual duty cycle being overridden. It is the user’s responsibility to ensure that the setting use does not allow the system to overheat
Maximum Duty cycle (%) This parameter specifies the maximum duty cycle that will be output to the System fan during normal operation. If the temperature of an associated sensor rises above the threshold specified in its
All-On Temperature parameter, the duty cycle will be overridden to 100%, regardless of the setting of the
Maximum Duty Cycle parameter.
Minimum Duty cycle (%) This parameter specifies the minimum duty cycle that will be output to the fan.
Primary Temperature Input This parameter specifies which temperature sensor will be the primary source for fan speed control decision-making. The user can choose any one of the four temperature sensors supported. The default and typical choice is the Processor temperature.

Primary Temperature Input choices:
• Processor – the Processor’s package temperature
• PCH – the Platform Controller Hub’s package temperature
• Memory – the temperature under the SO-DIMM connectors
• Motherboard – the temperature under the mini-PCIe* connectors
Secondary Temperature Input This parameter specifies which temperature sensor will be the secondary source for fan speed control decision-making. The user can choose any one of the four temperature sensors (other than that chosen to be the Primary Temperature Input) or they can choose None.

Secondary Temperature Input choices:
• Processor – the Processor’s package temperature
• PCH – the Platform Controller Hub’s package temperature
• Memory – the temperature under the SO-DIMM connectors
• Motherboard – the temperature under the mini-PCIe connectors
Under-Speed Threshold (ROM) This parameter specifies the threshold below which the fan speed sensor will report an unhealthy status.
 

Default values for the preset configuration:

 
Option Default Minimum Maximum
Fan Usage System N/A N/A
Under-Speed Threshold (RPM) 250 0 32000
Control Mode Auto N/A N/A
Minimum Duty Cycle (%) 40 0 100
Maximum Duty Cycle (%) 100 0 100
Primary Temperature Input Processor N/A N/A
Secondary Temperature Input Motherboard N/A N/A

The default settings are for a normal desktop working environment. These settings were chosen to minimize fan noise while keeping the system properly cooled in a normal working environment. The default settings may be modified in future BIOS revisions as Intel continues to fine tune them to get the best tradeoff between cooling and fan acoustics. You might need to change the fan control settings if your usage model includes any of the following:

  • Sustained file transfers for a long period of time
  • Stress testing
  • Benchmarking
  • Sustained processor usage of 75 percent or higher, for a long period of time