Technical product specification

Intel® Server Board S2600CP and Intel® Server System P4000CP Platform Management
Intel
®
Server Board S2600CP and Server System P4000CP TPS
Revision 1.8
Intel order number G26942-005
70
6.3.6 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 Sensor
1
 Baseboard Temperature Sensor
2
 CPU Margin Sensors
3,5,6
 DIMM Thermal Margin Sensors
3,5
 Exit Air Temperature Sensor
1,4,8
 Intel
®
C602 Chipset Temperature Sensor
4,6
 On-board Ethernet Controller Temperature Sensors
4,6
 Add-In Intel
®
SAS/IO Module Temperature Sensors
4,6
 PSU Thermal Sensor
4, 9
 CPU VR Temperature Sensors
4, 7
 DIMM VR Temperature Sensors
4, 7
 Integrated BMC Temperature Sensor
4, 7
 Global Aggregate Thermal Margin Sensors
3, 8
Note:
1. For fan speed control in Intel
®
chassis
2. For fan speed control in third 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*
A simple model is shown in the following figure which gives a high level graphic of the fan speed
control structure creates the resulting fan speeds.