INSTALLATION
INSTALLATION
P6B40D-A5 User’s Manual
P6B40D-A5 User’s Manual
12
12
Setting the Jumpers
Jumpers are used on this mainboard to select
various settings and features. A 2-pin jumper
has two settings: Open and Short (or Closed).
The jumper is closed by placing the Jumper
Cap across the two pins, thereby connecting
them. 3-pin jumpers can be set to pins 1-2 or 2-
3 connected. Pin-1 is labeled on the circuit
board.
Setting the CPU Clock Selection Jumper (JP5)
After installing the CPU, you must set the
clock selection jumper to match the frequency
of the CPU. Find the Jumper Block labeled
JP5 on the mainboard. Set the jumper
according to the table at right for the CPU
frequency you are using.
The CPU Clock corresponds to the number
marked on the CPU. The
Bus Clock
when
multiplied with the
Ratio
gives the
CPU
Clock
.
ü
ü
For a dual CPU system:
It is recommended that you use two identical CPUs in your
system. If your CPUs have different speed requirements, you must set the CPU Clock
Selection Jumper Block to the lower frequency.
•
If you are uncertain about the speed requirements of your particular CPU, you should
obtain Technical Documentation from the manufacturer. Such information is available
via the Intel WWW site.
3-pin Jumper
2-pin Jumper
Pin 1-2
Open
Pin 2-3
Short
CPU Clock
Ratio
Bus Clock
233MHz
x3.5
66MHz
266MHz
x4.0
66MHz
300MHz
x4.5
66MHz
333MHz
x5.0
66MHz
366MHz
x5.5
66MHz
350MHz
x3.5
100MHz
400MHz
x4.0
100MHz
450MHz
x4.5
100MHz
500MHz
x5.0
100MHz
550MHz
x5.5
100MHz
