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How to tackle the Jumpers:
1
2
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 Jumper is usually but not necessarily given a "JpX" legend.
• In the Jumper setting diagram, all jumper pins covered with
black marks stand for closed pins with jumper cap.
1
Jp X
Jumper with
Pin 2-3 closed
• 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.
2-8.1 JCLK1: CPU Clock/Overclock Select
JCLK1 is designed on board as a jumper for
CPU clock select. With JCLK1, user can
choose the way for a 100MHz CPU to run an
overclock on board.
1. Before setting the CPU clock, read the
Identification Legend on the CPU, find the
Max FSB and divide it by two. The result is
the default CPU clock.
2. Select the CPU clock you want from 100/
133/166/200MHz and set JCLK1 to match
your choice. Note that the 1-2. 4-5, 7-8
setting of JCLK1 is for auto-detection of
either 133 or latest 166MHz CPU only.
3. If you select a CPU clock which is higher
than your default CPU clock, it means that
an overclock is desired. However, if an
overclok fails to boot system, you should
resort to "Clearing CMOS" to rebooting your
s y s t e m . ( S e e C l e a r C M O S i n n e x t
paragraph.)
3
A 3-pin Jumper
3
1
Jumper with
all pins open
27
Chapter 2 Hardware Setup
A 2-pin Jumper cap to link
two header-pins together.
3
1
Jumper with
Pin 1-2 closed
JCLK1:
CPU Clock Select
(Default Setting)
8-9
7
4
4-5
1
2-3
7-8
7
4
4-5
1
2-3
7-8
7
4
5-6
1
2-3
8-9
7
4
5-6
1
2-3
7
7-8
4
4-5
1
1-2
3
100MHz
selected
133MHz
selected
166MHz
selected
200MHz
selected
Auto-detect
133/Latest
166MHz
CPU Type
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