Selecting The Cpu Frequency - AOpen MX64 User Manual

Hardware Installation
2.2 Jumpers
With the help of the Pentium II Pentium III / Celeron VID signal and SMbus, this
motherboard is a jumper-less design.

2.2.1 Selecting the CPU Frequency

The Pentium II \ Pentium III \ Celeron VID signal and the SMbus clock
generator provide CPU voltage auto-detection and allow the user to set CPU
frequency through the CMOS setup, no jumpers or switches are needed. The
correct CPU information is saved into the EEPROM. With these technologies,
the disadvantages of the Pentium based jumper-less design are eliminated.
There will be no worry of wrong CPU voltage detection and no need to re-open
the housing if the CMOS battery is lost.
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, 105, 110, 112, 115, 120, 124, 133,
140, 150, 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 = Ratio * External bus clock
Intel Pentium II /
Pentium III
Pentium II 233
Pentium II 266
Pentium II 300
Pentium II 333
Pentium II 350
Pentium II 400
Pentium II 450
Pentium III 450
Pentium III 500
Pentium III 550
Pentium III 533
Pentium III 600
2-4
CPU Core Frequency
233MHz=
266MHz=
300MHz=
333MHz=
350MHz=
400MHz=
450MHz=
450MHz=
500MHz=
550MHz=
533MHz=
600MHz=
Ratio FSB Clock
3.5x 66MHz
4x 66MHz
4.5x 66MHz
5x 66MHz
3.5x 100MHz
4x 100MHz
4.5x 100MHz
4.5x 100MHz
5x 100MHz
5.5x 100MHz
4x 133MHz
4.5x 133MHz