Datasheet

Intel
®
Server Board S2400GP TPS Platform Management Functional Overview
Revision 1.01
Intel order number G50295-002
69
6.11.8 Thermal Sensor Input to Fan Speed Control
The BMC uses various IPMI sensors as input to the fan speed control. Some of the sensors are
IPMI models of actual physical sensors whereas some are “virtual” sensors whose values are
derived from physical sensors using calculations and/or tabular information.
The following IPMI thermal sensors are used as input to the fan speed control:

 Front Panel Temperature Sensor1
 Baseboard Temperature Sensor2
 CPU Margin Sensors3,5,6
 DIMM Thermal Margin Sensors3,5
 Exit Air Temperature Sensor1, 4, 8
 PCH Temperature Sensor4,6
 On-board Ethernet Controller Temperature Sensors4, 6
 Add-In Intel SAS/IO Module Temperature Sensors4, 6
 PSU Thermal Sensor4, 9
 CPU VR Temperature Sensors4, 7
 DIMM VR Temperature Sensors4, 7
 iBMC Temperature Sensor4, 7
 Global Aggregate Thermal Margin Sensors3, 8
Note:
1. For fan speed control in Intel chassis
2. For fan speed control in 3rd party chassis
3. Temperature margin from throttling threshold
4. Absolute temperature
5. PECI value
6. On-die sensor
7. On-board sensor
8. Virtual sensor
9. Available only when PSU has PMBus
The following illustration provides a simple model showing the fan speed control structure that
implements the resulting fan speeds.