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2.2.4 AGP Ratio
JP23
AGP Ratio
To improve system performance, AX6BC Pro has
implemented this jumper for AGP to synchronize the
1-2
Auto (default)
CPU 100Mhz (or above) external frequency. We
3-4
2/3
recommend
5-6
1/1
overclocking. Some AGP cards can not take 100MHz
bus frequency and may cause overclocking failure.
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
66MHz
Low
66MHz
Low
66MHz
Low
100MHz
High
100MHz
High
100MHz
High
100MHz
High
100MHz
High
100MHz
High
Warning: The specification of AGP is maximum 66Mhz
clock. If the bus clock is larger than 66MHz, setting this
Hardware Installation
choosing
a
better
JP23
JP23
2 4 6
2 4 6
1 3 5
1 3 5
Auto
2/3
(Default)
Bus clock
AGP clock
66MHz
66MHz
100MHz
100MHz
100MHz
66MHz
100MHz
66MHz
100MHz
66MHz
100MHz
100MHz
133MHz
88.6MHz
133MHz
88.6MHz
133MHz
133MHz
AGP
card
for
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2 4 6
1 3 5
1/1
JP23
1-2
1-2
3-4
1-2
3-4
5-6
1-2
3-4
5-6
2-7
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