User Guide

Hardware Installation
2-4
2.2 Jumpers
With the help of Pentium II / Pentium III / Celeron VID signal and SMbus, this
motherboard is jumper-less design.
2.2.1 Selecting the CPU Frequency
Celeron PPGA 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 à Chipset Features Setup à CPU Clock Frequency
(The possible setting is 66.8, 75, 83.3, 100, 103, 112, 124/31, 124/41, 133/33,
133/44, , 138, 143, 148 and 153 MHz)
BOIS Setup à Chipset Features Setup à 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 = CPU Ratio * CPU FSB
Intel Pentium II
/Pentium III
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
Pentium III - 450 450MHz = 4.5x 100MHz
Pentium III - 500 500MHz = 5x 100MHz
Pentium III - 550 550MHz = 5.5x 100MHz
INTEL Celeron CPU Core Frequency Ratio External Bus Clock