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4-14 www.hp.com Technical Reference Guide
System Support
The RPM (speed) of all fans is the result of the temperature of the CPU as sensed by speed
control circuitry. The fans are controlled to run at the slowest (quietest) speed that will maintain
proper cooling.
Units using chassis and CPU fans must have both fans connected to their corresponding headers
to ensure proper cooling of the system.
4.6 Register Map and Miscellaneous Functions
This section contains the system I/O map and information on general-purpose functions of the
ICH10 and I/O controller.
4.6.1 System I/O Map
Table 4-9 lists the fixed addresses of the input/output (I/O) ports.