User`s manual
4-16
X8SIL/X8SIL-F/X8SIL-V
The Early Alarm – the Overheat LED and system buzzer will be activated exactly
when the High level is reached. The CPU fan will run at full speed to bring the
CPU temperature down.
Note: In both the alarms above, please take immediate action as shown below.
See CPU Overheat Alarm to modify the above alarm settings.
User intervention: If the system buzzer and Overheat LED has activated, take
action immediately by checking the system fans, chassis ventilation and room
temperature to correct any problems. Note: the system may shut down if it con-
tinues for a long period to prevent damage to the CPU.
Notes: The CPU thermal technology that reports absolute temperatures
(Celsius/Fahrenheit) has been upgraded to a more advanced feature by Intel
in its newer processors. The basic concept is that each CPU is embedded
by a unique temperature information that the motherboard can read. This
‘Temperature Threshold’ or ‘Temperature Tolerance’ has been assigned at
the factory and is the baseline by which the motherboard takes action during
different CPU temperature conditions (i.e., by increasing CPU Fan speed,
triggering the Overheat Alarm, etc). Since CPUs can have different ‘Tem-
perature Tolerances’, the installed CPU can now send its ‘Temperature Toler-
ance’ to the motherboard resulting in better CPU thermal management.
Supermicro has leveraged this feature by assigning a temperature status to
certain thermal conditions in the processor (Low, Medium and High). This
makes it easier for the user to understand the CPU’s temperature status,
rather than by just simply seeing a temperature reading (i.e., 25
o
C).
The information provided above is for your reference only. For more information on
thermal management, please refer to Intel’s Web site at www.Intel.com.
Fan Speed Control Modes
This feature allows the user to decide how the system controls the speeds of the
onboard fans. The CPU temperature and the fan speed are correlative. When the
CPU on-die temperature increases, the fan speed will also increase for effective
system cooling. Select "Full Speed/FS" to allow the onboard fans to run at full
speed (of 100% Pulse Width Modulation Duty Cycle) for maximum cooling. The
FS setting is recommended for special system conguration or debugging. Select
"Performance/PF" for the onboard fans to run at 70% of the Initial PWM Cycle for
better system cooling. The PF setting is recommended for high-power-consuming
and high-density systems. Select "Balanced/BL" for the onboard fans to run at 50%
of the Initial PWM Cycle in order to balance the needs between system cooling
and power saving. The BL setting is recommended for regular systems with normal
hardware congurations. Select "Energy Saving/ES" for the onboard fans to run at
30% of the Initial PWM Cycle for best power efciency and maximum quietness.
The Options are: Full Speed (@100% of PWM Cycle), Performance (@70% of