28
P5F97/P5F103 User’s Manual
CPU Bus Clock:
The CPU Bus Clock is defined as the CPU input
clock. For example: the CPU Bus Clock for AMD K6, 266 and 300
MHz are 66 MHz and 100MHz for K6-2, 250 and 300MHz.
DIP Switch (SW2) selects CPU Bus Clock
CPU Core and I/O Voltages:
Two voltages V
CORE
and V
I/O
are
required for Pentium class CPUs. The V
CORE
is used for CPU inter-
nal operation and the V
I/O
is used to supply the voltage for external
interface.
The P5F97/P5F103 mainboard has a jumper (JP7) which
connect between Vcore and Vi/o. You need to short JP7 only when
a Intel Pentium O.D.P. (Overdrive processor) is installed.
Bus Clock
SW2-P1
SW2-P2
SW2-P3
JP13
60MHz
ON
ON
ON
Open
66MHz
(default)
ON
ON
OFF
Open
68MHz
ON
OFF
ON
Open
75MHz
OFF
ON
ON
Open
83MHz
OFF
ON
OFF
Open
95MHz
OFF
OFF
ON
Open
100MHz
OFF
OFF
OFF
Open
105MHz
ON
OFF
OFF
Close
110MHz
ON
OFF
ON
Close
115MHz
ON
ON
OFF
Close
120MHz
ON
ON
ON
Close
Chapter 2:Hardware Installation
8
2
4
4
3
E
X
ID
E
1
ID
E
2
JP
1
3
S
W
2
S
W
1
