User`s manual
Chapter 4: BIOS
4-19
trol Interface) using DTS (Digital Thermal Sensors). Intel processors only
provide PECI counts as references for fan speed controls. So all our Intel
processor-based motherboards will be/have been updated to change the
CPU temperature display from numbers (absolute temperatures) to text (low,
medium, and high).
Each processor has a DTS and every processor’s DTS is individually cali-
brated at the factory. DTS’ function is to provide digital data that informs
the system of the processor’s thermal throttle point. Since this value varies
for every processor, it is impossible to assign a particular temperature level
at the BIOS level. Instead, Intel developed PECI. PECI reports a negative
value expressing the information imbedded in DTS and subtracting from it
the current temperature reading. For example, if the assigned DTS thermal
throttle point value in a processor is 85 °C and the current temperature read-
ing is 35 °C, the value reported by PECI would be -50 °C. This PECI ‘count’
is monitored by your Supermicro motherboard and has been congured to
display information according to a particular PECI ‘count’. These are displayed
in the BIOS as Low, Medium and High. A reading of “High” means that the
PECI count has exceeded the DTS thermal throttle point (PECI count of zero
and above).
The information provided above is for your reference only. For more informa-
tion on thermal management, please refer to Intel’s Web site at www.Intel.
com.
System Temperature
This item displays the absolute system temperature as detected by the BIOS.
CPU Fan/Fan 1 to Fan 6
If the feature of Auto Fan Control is enabled, the BIOS will automatically display
the status of each fan as specied.
Fan Speed Control Modes
This feature allows you 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, and
vice versa. If the option is set to “4-pin”, the fan speed will be controlled by
Pulse Width Modulation (PWM). Select “Workstation” or "Server" if your system
is used as a Workstation or Server respectively. Select “Disable” to disable the
fan speed control function to allow the onboard fans to constantly run at full
speed (12V). The Options are: 1. Disable and 2. 3-pin (server) 3-pin (worksta-