User Guide

Hardware Installation
2-4
2.2 Jumpers
With the help of Pentium II VID signal and SMbus, this motherboard is jumper-
less design.
2.2.1 Selecting the CPU Frequency
Pentium II VID signal and SMbus clock generator provide CPU voltage auto-
detection and allow user to set CPU frequency through CMOS setup, no jumper
or switch is needed. The correct CPU information is saved into EEPROM, with
these technologies, the disadvantages of Pentium base jumper-less design are
eliminated. There will be no worry of wrong CPU voltage detection and no need
to re-open the housing if CMOS battery loss.
The CPU frequency selection is set by going into:
BOIS Setup  Chipset Features Setup  CPU Clock Frequency
(The possible setting is 66.8, 68.5, 75, 83.3, 100, 103, 112, 117, 124, 129,
133.3, 138, 143, 148 and 153 MHz)
BOIS Setup  Chipset Features Setup  CPU Clock Ratio
(The possible setting is 1.5x, 2x, 2.5x, 3x, 3.5x, 4x, 4.5x, 5x, 5.5x, 6x, 6.5x, 7x,
7.5x, and 8x)
Core frequency = Ratio * External bus clock
INTEL Pentium II CPU Core Frequency Ratio External Bus Clock
Pentium II - 233 233MHz = 3.5x 66MHz
Pentium II - 266 266MHz = 4x 66MHz
Pentium II - 300 300MHz = 4.5x 66MHz
Pentium II - 333 333MHz = 5x 66MHz
Pentium II - 350 350MHz= 3.5x 100MHz
Pentium II - 400 400MHz= 4x 100MHz
Pentium II - 450 450MHz= 4.5x 100MHz
Warning: INTEL 440BX chipset supports maximum 100MHz
external CPU bus clock, the higher clock settings are for internal
test only. These settings exceed the specification of BX
chipset, which may cause serious system damage.