INSTALLATION
INSTALLATION
User’s Manual
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 Jumpers (JP5, JFS0, JFS1 and JFS2)
After installing the CPU, you must set the
clock selection jumper to match the frequency
of the CPU. Find the Jumper Blocks labeled
JFS0, JFS1, JFS2 and 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
.
These jumpers automatically set the ISA Clock as well.
•
Intel 440EX chipset supports only 66 MHz bus clock. The 75/83MHz settings are for
internal test only. Over-clocking may cause serious system damage.
•
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
Ratio
Bus Clock
233MHz
x3.5
66MHz
266MHz
x4.0
66MHz
300MHz
x4.5
66MHz
333MHz
x5.0
66MHz
366MHz
x5.5
66MHz
400MHz
x6.0
66MHz
