26
B7A-F
1
1
3
3
1
3
Jumper with
Pin 2-3 closed
Jumper with
all pins open
Jumper with
Pin 1-2 closed
If a pin-header (of 2 or more pins) is
designed in such a way that its pins
can be closed or linked together to
set up a specific function, this header
is called a jumper in this manual.
A 3-pin Jumper
The conductor inside the cap
links two header-pins together.
• A Jumper is usually but not necessarily given a “JpX” legend.
Jp X
• Do not remove any jumper cap when power is on. Always
make sure the power is off before changing any jumper settings.
Otherwise, mainboard could be damaged.
2-7.1 How to tackle the Jumpers:
• In the Jumper setting diagram, all jumper pins covered with
black marks stand for closed pins with jumper cap.
1
2
3
A 2-pin
Jumper
Cap
2-7.2 JCLK2: CPU Clock Boot Select
CPU Clock Boot Select
JCLK2:
(default)
2-3 closed
For 166MHz CPU
1-2 closed
Auto Detect
100MHz / 133MHz
1
1
2. Setting JCLK2 1-2 closed is for auto-
detection of 100/133MHz CPU at booting
system.
3. Setting JCLK2 2-3 closed is for 166MHz
CPU to boot system. 100/133MHz CPU
will fail to boot herewith.
4. If 100/133MHz CPU fails to boot system ,
you should excute the nVIDIA-Boot-
Failure-Restart Procedure to reboot
system.
1. Before booting system, please read the
section (2-1.1) of this manual to find out
the CPU clock of your CPU .