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Chapter 2 Hardware Setup
Jp2 is designed on board for CPU clock select.
2-8.2 Jp2: CPU Clock/Overclock Select
2. Setting Jp2 1-2 closed is for auto-detection of 100/133MHz CPU.
3. Setting Jp2 2-3 closed is to select a CPU clock 166MHz for your
CPU. If 166MHz is an overclock for your CPU, it may or may not boot
your system. If an overclock fails to boot system, you should restore
the default setting and then clear CMOS to reboot your system. (See
Clear CMOS in next paragraph.)
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.
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.
2-8.1 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
Note on 100MHz CPU Installation:
Whenever a 100MHz CPU(such as Duron) is used
to start system, users should first restore Jp2 to
default setting and clear CMOS with J5, so that
the 100MHz CPU clock can be surely detected.
After starting system, users should enter “Advan-
ced Chipset Features” of BIOS Setup and set the
“FSB Frequency” to “100MHz”.
Only after configuring “FSB Frequency” to “100MHz”, could you start
system with 100MHz CPU without trouble.
CPU Clock Select
Jp2 :
(default)
1-2 closed
Auto Detect
100MHz / 133MHz
2-3 closed
166MHz Select
1
1
Summary of Contents for 75FRN Series
Page 6: ...9 Contents Memo...
