RadiSys PROCELERANT SB5520DT1-SATA - Page 52

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BIOS Configuration
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Fan Speed Control Modes This feature enables you to decide how the system controls the speed of the eight
onboard fans. With the fan speed control set to disabled, all the fans run at full
speed. Setting the fan speed control to enabled gives you the ability to customize the
fan speed control, including the fan speed input source and the fan speed ramp
profile.
Each of the eight onboard fans can be independently controlled by one of three
input sources: CPU1 temperature, CPU2 temperature, or system temperature. The
fan speed ramp profile for each of the input sources is configurable by specifying the
minimum and maximum for the fan PWM operating range as well as the minimum
and maximum CPU temperature or system temperature. The BIOS setup options are
listed below along with a chart explaining the fan speed implementation:
 Fan 1 Control Source Select – CPU1, CPU2, or System Temp
 Fan 2 Control Source Select – CPU1, CPU2, or System Temp
 Fan 3 Control Source Select – CPU1, CPU2, or System Temp
 Fan 4 Control Source Select – CPU1, CPU2, or System Temp
 Fan 5 Control Source Select – CPU1, CPU2, or System Temp
 Fan 6 Control Source Select – CPU1, CPU2, or System Temp
 Fan 7 Control Source Select – CPU1, CPU2, or System Temp
 Fan 8 Control Source Select – CPU1, CPU2, or System Temp
 CPU1 Tcontrol Min Value – The PECI count below Tcontrol indicating the start of
the fan speed ramp profile. For example, a value of 20 translates to [Tcontrol –20].
 CPU1 Tcontrol Max Value – The PECI count above Tcontrol indicating the end of
the fan speed ramp profile. For example, a value of 5 translates to [Tcontrol + 5].
 CPU1 Fan Speed Min Value – The minimum fan speed based on a 256 point
scale. Minimum recommended PWM is 20% or [050]
 CPU1 Fan Speed Max Value – The maximum fan speed based on a 256 point
scale. Full speed is [255].
 CPU2 Tcontrol Min Value – The PECI count below Tcontrol indicating the start of
the fan speed ramp profile. For example, a value of 20 translates to [Tcontrol –20].
 CPU2 Tcontrol Max Value – The PECI count above Tcontrol indicating the end of
the fan speed ramp profile. For example, a value of 5 translates to [Tcontrol + 5].
 CPU2 Fan Speed Min Value – The minimum fan speed based on a 256 point
scale. Minimum recommended PWM is 20% or [050].
 CPU2 Fan Speed Max Value – The maximum fan speed based on a 256 point
scale. Full speed is [255].
Fan Speed Control Modes
(continued)
 System Temp Min Value – The system temperature value indicating the start of the
fan speed ramp profile.
 System Temp Max Value – The system temperature value indicating the end of the
fan speed ramp profile.
 System Fan Speed Min Value – The minimum fan speed based on a 256 point
scale. Minimum recommended PWM is 20% or [050].
 System Fan Speed Max Value The maximum fan speed based on a 256 point
scale. Full speed is [255].
Table 50. Hardware Health Monitor submenu (Continued)
BIOS item Usage