Specifications

PP 41x/03x 11-1
11 SYSTEM MANAGEMENT
11.1 Power Management
The Intel Core Duo processor incorporates a mechanism for changing the processor’s operating
frequency and core voltage under software control. By making these reductions the board’s
maximum power consumption is also reduced substantially.
The Intel Core Duo processor supports a number of discrete operating frequencies that vary
between 1.0 GHz and full speed (see Table 11-1). The BIOS provides a Setup menu (Advanced
| Advanced Processor Options | CPU Operating Frequency) that allows the
operating frequency of the CPU to be set prior to booting an operating system. By default the CPU
will operate at full speed.
2.0 GHz Intel Core Duo
Processor T2500
1.66 GHz Intel Core Duo
Processor L2400
2.16 GHz Intel Core 2
Duo Processor T7400
2.0 GHz 2.16 GHz
1.66 GHz 1.66 GHz 1.66 GHz
1.33 GHz 1.33 GHz 1.33 GHz
1.0 GHz 1.0 GHz 1.0 GHz
Table 11-1 CPU Operating Speed BIOS Options
This mechanism for power reduction allows the board to operate in environments where power
capacity is limited (e.g. under battery power), or in systems where cooling airflow is less than
adequate. In this last case it may be wise to also consider some of the Thermal Management
options available on this board (see Section 11.2).
NOTE: During POST, the BIOS will always report the maximum possible CPU frequency,
as specified by the CPU’s Brand String.