Intel
®
Server Board S2600CP and Server System P4000CP TPS Intel
®
Server System P4000CP Thermal Management
Revision 1.1
Intel order number G26942-003
121
12.3.3 Fan Control
The fans provided in the Intel
®
Server Chassis P4000M Family contains a tachometer signal
that can be monitored by the server management subsystem of the Intel
®
Server Boards for
RPM (Revolutions per Minute) detection.
The server board monitors several temperature sensors and adjusts the PWM (Pulse Width
Modulated) signal to drive the fan at the appropriate speed.
The front panel of the chassis has a digital temperature sensor connected to the server board
through the front panel’s bus. The server board firmware adjusts the fan speed based on the
front panel intake temperature and processor temperatures.
Refer to the baseboard documentation for additional details on how fan control is
implementation.
12.3.4 Fan Header Connector Descriptions
All system fan headers support pulse width modulated (PWM) fans for cooling the processors in
the chassis. PWM fans have an improved RPM range (20% to 100% rated fan speed) when
compared to voltage controlled fans.
Fixed chassis fans are a 4-wire/4-pin style designed to plug into 4-pin or 6-pin SSI Fan headers.
When plugged into a 6-pin header, only the first four signals are used (Pwr, Gnd, Tach,PWM).
Hot-swap chassis fans are a 6-wire/6-pin style designed to plug into 6-pin headers. The extra
signals provide for fan redundancy and failure indications (Pwr, Gnd, Tach, PWM, Presence,
and Failure).
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