Supero SUPER P6DBE, User Manual

Page: 45 / 104

Chapter 2: Installation
2-7
2-5 Explanation and
Diagram of Jumper/
Connector
To modify the operation of the
motherboard, jumpers can be used
to choose settings. Jumpers cre-
ate shorts between two pins and
change the function of the con-
nector. Pin 1 is identified with a
square.
2-6 Changing the CPU
Speed
To change the CPU speed for a
Pentium II processor, change the
jumpers shown on Table 2-1. The
example on the right will show you
which CPU Core/Bus Ratio to use.
The general rule is to divide the
CPU speed by the bus speed (100
MHz). If you have a 400 MHz CPU,
dividing it by 100 will give you a
CPU Core/BUS Ratio of 4.0. After
determining the CPU Core/Bus Ra-
tio, refer to Table 2-1 for settings
of JB1, JB2, JB3 and JB4.
3 2 1
C o n n e c t o r
P i n s
J u m p e r
C a p
Setting
Pin 1-2 short
C P U C o r e /
Bus Ratio
3.0
3.5
4.0
4.5
5.0
5.5
6.0
J B 1
O N
O F F
O N
O F F
O N
O F F
O N
J B 2
O F F
O F F
O N
O N
O F F
O F F
O N
J B 3
O N
O N
O F F
O F F
O F F
O F F
O N
J B 4
O N
O N
O N
O N
O N
O N
O F F
Table 2-1
Pentium II Speed Selection
400 MHz = 100 MHz x 4.0
CPU Speed = Bus Freq. x Ratio
Example of 4.0
CPU Core/Bus Ratio
JB1 JB2 JB3 JB4
ON ON OFF ON
Note: SUPER P6DBU/P6SBU must be running at
100 MHz bus speed to support Pentium II 350/400
MHz processors.