17
CPU Installation
The 586IVX allows for easy installation of CPUs. Make sure all jumpers are
set correctly before applying power or you may damage the CPU or system
board. Use a needle-nosed plier to move the jumpers if necessary.
Jumpers JP10, JP11 and JP12 are used to set the external bus clock of
your processor. Refer to the following pages for the external bus clock that
corresponds to your processor and set these jumpers accordingly. The
clock generator will determine the external bus clock that must be sent to
the processor through these settings.
Jumper JP5 is used to set the frequency ratio of your processor. Refer to
the following pages for the frequency ratio that corresponds to your proces-
sor and set this jumper 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 used 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 P-rating system which is the overall
CPU performance rating. Under the system, these processors slightly out-
perform Intel’s Pentium processors.
Jumpers JP2, JP3, JP4 and JP7 are used to set the voltage of your proces-
sor. Make sure these jumpers are set correctly, otherwise your system will
hang.
The table below shows the External System Bus Clock of the CPUs sup-
ported by the system board and their corresponding PCI Clock and ISA Bus
Clock.
External System Bus Clock
50MHz
55MHz
60MHz
66MHz
PCI CLK
25MHz
27.5MHz
30MHz
33MHz
ISA Bus CLK
8.333MHz
9.1666MHz
7.5MHz
8.25MHz