Hardware Installation
2-7
2.2.4 AGP Ratio
JP23
1-2
3-4
5-6
AGP Ratio
Auto (default)
2/3
1/1
To improve system performance, AX6BC Pro has
implemented this jumper for AGP to synchronize the
CPU 100Mhz (or above) external frequency. We
recommend choosing a better AGP card for
overclocking. Some AGP cards can not take 100MHz
bus frequency and may cause overclocking failure.
JP23
1 3 5
2 4 6
Auto
(Default)
JP23
1 3 5
2 4 6
2/3
JP23
1 3 5
2 4 6
1/1
There is a "66/100" signal pin from CPU for ZX chipset to automatically identify
AGP clock, this is important for jumperless design. When a 66MHz Pentium II
CPU is used, the north bridge will synchronize the CPU external frequency and
the AGP bus frequency. Therefore, when you set the CPU external frequency to
100MHz, the AGP bus will also runs at 100MHz.
With 100MHz Pentium II CPU, the north bridge automatically set AGP frequency
to 2/3 AGP frequency. In other words, the AGP card will still runs at 66MHz while
the CPU is running at 100MHz external frequency.
Except Auto setting, you may also set this jumper to 2/3 or 1/1. Below is a table
for better understanding:
CPU Type
66/100 signal
Bus clock
AGP clock
JP23
66MHz
Low
66MHz
66MHz
1-2
66MHz
Low
100MHz
100MHz
1-2
66MHz
Low
100MHz
66MHz
3-4
100MHz
High
100MHz
66MHz
1-2
100MHz
High
100MHz
66MHz
3-4
100MHz
High
100MHz
100MHz
5-6
100MHz
High
133MHz
88.6MHz
1-2
100MHz
High
133MHz
88.6MHz
3-4
100MHz
High
133MHz
133MHz
5-6
Warning:
The specification of AGP is maximum 66Mhz
clock. If the bus clock is larger than 66MHz, setting this
