AOpen AX6BC User Manual

Hardware Installation
2-6
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 has
implemented this jumper for AGP to synchronize the
CPU 100Mhz (or above) external frequency. We
recommend you choose 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 BX 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
item to Enabled may cause serious system damage.

AOpen AX6BC Specifications

General

Brand	AOpen
Model	AX6BC
Category	Motherboard
Language	English