DFI-ITOX 586ITOX, User Manual

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586ITOX System Board User’s Manual
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Processor Upgrade Information
The system board allows for
easy installation of
processors. Make sure all
jumpers are set correctly
before applying power or
you may damage the
processor or system board.
Use a needle-nosed plier to
move the jumpers if
necessary.
Jumpers JP4, JP5 and JP7 are
used to set the external bus
clock of your processor. The clock generator will determine the
external bus clock that must be sent to the processor through
these settings. Refer to the following pages for the external bus
clock that corresponds to your processor and set these jumpers
accordingly.
After setting these jumpers, an Intel processor will multiply the
external bus clock by the frequency ratio to become the internal
clock speed. Internal clock speed is the commonly known speed of
Intel processors in the market and is the actual operating clock of
the processor (external bus clock x frequency ratio = internal clock
speed). Cyrix and AMD processors use the PR-rating system which
is the overall processor performance rating.
Jumper JP1 is used to set the voltage of your processor. Make sure
these jumpers are set correctly, otherwise your system will hang.
The table below shows the External System Bus Clock of the
processors supported by the system board and their corresponding
PCI Clock and ISA Bus Clock.
Ext. System Bus Clock
60MHz
66MHz
PCI CLK
30MHz
33MHz
ISA Bus CLK
7.5MHz
8.25MHz