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Quick Installation Guide
Setting CPU Core Voltage
This motherboard supports Pentium II (Klamath) VID funtion, the CPU core voltage is
automatically detected, the range is from 1.3V to 3.5V.
Setting CPU Frequency
The CPU frequency selection is set by going into:
BOIS Setup à Chipset Features Setup à CPU Clock Frequency
(The possible setting is 66, 68.5, 75 and 83.3 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
CPU Core Frequency
Pentium II 233
233MHz =
Pentium II 266
266MHz =
Pentium II 300
300MHz =
Pentium II 333
333MHz =
Connecting CPU Fan
Compatibility issue between Intel PIIX4 chipset & Seagate HDD
Some old Seagate HDD without Ultra DMA may have compatibility issue with 3.3V PIIX4
chipset (Intel 440LX & 430TX). New Ultra DMA models have no such problem.
Tip: If you find a green label on the top cover between the label and the damper (the text
on the outer circumference of the label reads "3.3V & 5V Interface Compatible"), this
HDD is tested OK for PIIX4.
Battery-less Motherboard
To preserve the earth, AOpen AX6LC implements the world first battery-less motherboard
design. There is no need to have battery for RTC (real time clock) and CMOS Setup as long
as ATX power cable is plugged. In case of the AC power is shutdown or power cord is
removed by accident, the CMOS Setup and system configuration can be restored from
EEPROM, only the system clock needed to be re-set to current date/time.
Connecting Front Panel Cable
Attach the power LED, keylock, speaker,
and reset switch connectors to the
corresponding pins.
Ratio
External Bus Clock
3.5x
66MHz
4x
66MHz
4.5x
66MHz
5x
66MHz
Plug in the fan cable to the 3-pin CPU FAN or FAN
connector. Both of these two fan connectors support
hardware monitoring function, however, you can only
use the CPU FAN connector to control the fan power
ON/OFF.
~2~
1
11
+
Keylock
+
Power LED
+
+
Speaker
Reset
10 20
2
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