Fujitsu siemens Silent Fan Product Facts
Silent Fan
Product Silent Fan
Pages 2
Contents
Positioning and target groups 2
Customer benefits 2
Product description 2
Technical data 2
Issue October 2005
Product Facts ⏐ Issue: October 2005 ⏐ Product: Silent Fan Page 2 / 5
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Positioning and target groups
Integrators & end customers
Customer benefits
The fan control function integrated on Fujitsu Siemens Computers mai nboards enables customers to build quiet and faulttolerant PC systems. This reduces maintenance times and makes for a more pleasant working environment.
Product description
Fujitsu Siemens Computers Premium mainboards feature a hardware controller with the capability to monitor the fans in the
system and control them in accordance with prevailing temperatures. It can also be used to slow down (throttle) the CPU in
order to achieve an additional cooling effect. As the Silent Fan controller is independent of both processor and operating
system, continuity of function is guaranteed.
Technical data
Controller
Premium mainboards include a Fujitsu Siemens Computers-developed microcontroller which constantly records temperatures
from up to four sensors: CPU, two internal sensors (optional one external), HDD. These measurements are used to control and
monitor the speeds of the CPU fan, power supply fan (special power supplies with controllable fans only) and up to three
optional fans. If necessary, the CPU is also throttled, which, though adversely affecting the performance of the system, leads to
lower heat dissipation as a result of the reduced power consumption. This, in turn, means that the fans can operate at slower
speeds, thus making the system quieter.
The CPU temperature is measured directly on the processor die by means of a diode measurement. This measuring method is
unique and requires no additional sensor on the heat sink or under the processor. The advantage of this type of measurement is
the higher precision, thus ensuring that the speed of the fans and the throttling of the CPU can be reduced to a minimum. The
user is thus provided with a fully optimized PC system: as fast as necessary, as quiet as possible.
The figure shows the inputs and outputs of the microcontroller, which operates totally ind ependently of processor, memory and
operating system. The system components continue to be protected even if the memory or CPU crashes.
Temp. Sensor 0 CPU
Temp. Sensor 1 onBoard
Temp. Sensor 2 AUX
(external) optional
HDD Temp.
Housing Open
Messa
e LED
Silent Fan
Silent Fan Controlle
Control
Supervision
Control
Supervision
Control
Supervision
CPU Slowdown (Throttling)
System Sleep or
System Power Off
System Reset
PSU
Fan 1*
CPU
Fan
Fan 2, 3, 4
* with special, controllable power supply fans only
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