AOpen AX6BC Easy Installation Manual page 3

Installing CPU and Fan
Plug CPU to slot1 connector. Be careful of CPU
orientation. Plug in the fan cable to the 3-pin
CPUFAN or FAN connector.
Note: Some CPU fans do not have
sense pin, so that cannot support
fan monitoring.
Setting CPU Core Voltage
This motherboard supports Pentium II / Pentium III CPU VID function. The CPU
core voltage will be automatically detected and the range is from 1.3V to 3.5V.
Setting CPU Frequency
The CPU frequency selection is set by going into:
BIOS Setup > Chipset Features Setup > CPU Clock Frequency
CPU Ratio 1.5x, 2x, 2.5x, 3x, 3.5x, 4x, 4.5x, 5x, 5.5x, 6x, 6.5x, 7x, 7.5x, and 8x
66.8, 68.5, 75, 83.3, 100, 103, 112, 117, 124, 129, 133.3, 138, 143,
CPU FSB
148 and 153 MHz.
Core Frequency = CPU FSB Clock * CPU Ratio
CPU CPU Core Frequency
Celeron 300A 300MHz =
Celeron 366 366MHz=
Pentium II 233 233MHz =
Pentium II 333 333MHz =
Pentium II 350 350MHz=
Pentium II 400 400MHz =
Pentium III 450 450MHz=
Pentium III 500 500MHz =
Pentium III 550E 550MHz =
Pentium III 600E 600MHz =
Pentium III 650E 650MHz =
Pentium III 700E 700MHz =
GND
+12V
SENSE
FSB Clock Ratio
66MHz 4.5x
66MHz 5.5x
66MHz 3.5x
66MHz 5x
100MHz 3.5x
100MHz 4x
100MHz 4.5x
100MHz 5x
100MHz 5.5x
100MHz 6x
100MHz 6.5x
100MHz 7x
Setting AGP / FSB Clock Ratio
2 4 6
1 3 5
Auto (default)
It is recommended to set JP23 at Auto unless you
are overclocking. There are two CPU types, 66MHz
FSB and 100/133MHz FSB. If JP23 is set at Auto,
the AGP clock ratio will be automatically
determined by chipset. For 66M CPU, it is 1/1, for
100/133M CPU, it is 2/3. You can also manually
decide AGP frequency if you are overclocking.
AGP Clock = CPU FSB Clock x Clock Ratio
Clock Ratio
Auto with 66MHz CPU, 1/1
Auto with 100/133MHz CPU, 2/3
Auto with 100/133MHz CPU, 2/3, overclocking
2/3, overclocking
2/3, overclocking
2/3, overclocking
1/1, overclocking
1/1, overclocking
1/1, overclocking
Warning: INTEL 440BX chipset supports maximum 100MHz
FSB and 66MHz AGP clock, higher clock setting may cause
serious system damage.
Tip: If your system hangs or fails to boot
because of overclocking, simply use
Home
<Home> key to restore the default setting
(233MHz).
2 4 6 2 4 6
1 3 5 1 3 5
2/3 1/1
CPU FSB Clock AGP Clock
66MHz 66MHz
100MHz 66MHz
133MHz 88.6MHz
100MHz 66MHz
133MHz 88.6MHz
153MHz 102MHz
100MHz 100MHz
133MHz 133MHz
153MHz 153MHz