Setting Cpu Voltage & Frequency - AOpen AX45-533 Easy Installation Manual

3. Installing CPU & System Fan
Plug in the CPU fan cable to the 3-pin CPUFAN1 connector. If you have chassis fan, you
can also plug it on SYSFAN2 (FAN2) or SYSFAN3 (FAN3) connector.
SYSFAN3 Connector
4. Connecting ATX Power Connector
This motherboard comes with a 20-pin ATX power connector and an extra 4-pin connector
as shown below. Make sure you plug in the right direction. We strongly recommend you to
insert the 4-pin connector before connecting the 20-pin connector.
SYSFAN2 Connector
CPUFAN1 Connector
GND
+12V
SENSOR
Note: Some CPU fans do not have
sensor pin so they cannot support fan
monitoring.
Ground
12V
12V
Pin1
Ground
COM
COM
PS-ON
COM
COM
-5V
-12V
+5V
+3.3V
+5V
+3.3V
+12V
+3.3V
5VSB
COM
PO-OK
+5V
COM
COM
+5V
5. Setting CPU Voltage & Frequency
Setting CPU Core Voltage
This motherboard supports CPU VID function. The CPU core voltage will be automatically
detected.
Setting CPU Frequency
This motherboard is CPU jumper-less design, you can set CPU frequency through the
BIOS setup, and no jumpers or switches are needed. The default setting is "table select
mode". You can adjust the FSB from "CPU Host/SDRAM/PCI Clock" for overclocking.
BIOS Setup > Frequency / Voltage Control > CPU Speed Setup
CPU Ratio 8x, 9x, 10x... 21x, 22x, 23x, 24x
CPU FSB (By BIOS table) 100, 105, 108, 112 and 133MHz.
Northwood CPU CPU Core Frequency
Pentium 4 1.6G 1600MHz
Pentium 4 1.6G 1600MHz
Pentium 4 1.7G 1700MHz
Pentium 4 1.8G 1800MHz
Pentium 4 2.0G 2000MHz
Pentium 4 2.2G 2200MHz
Pentium 4 2.4G 2400MHz
Pentium 4 2.4G 2400MHz
Willamette CPU CPU Core Frequency
Pentium 4 1.5G 1500MHz
Pentium 4 1.6G 1600MHz
Pentium 4 1.7G 1700MHz
Pentium 4 1.8G 1800MHz
Pentium 4 1.9G 1900MHz
Pentium 4 2.0G 2000MHz
Celeron CPU CPU Core Frequency
1.7G 1700MHz
1.8G 1800MHz
Warning: SIS 645DX/961B Chipset
supports maximum 400MHz
(100/133MHz*4) system bus
66MHz AGP clock; higher clock setting
may cause serious system damage.
FSB Clock System Bus Ratio
100MHz 400MHz 16x
133MHz 533MHz 12x
133MHz 533MHz 13x
100MHz 400MHz 18x
100MHz 400MHz 20x
100MHz 400MHz 22x
100MHz 400MHz 24x
133MHz 533MHz 18x
FSB Clock System Bus Ratio
100MHz 400MHz 15x
100MHz 400MHz 16x
100MHz 400MHz 17x
100MHz 400MHz 18x
100MHz 400MHz 19x
100MHz 400MHz 20x
FSB Clock System Bus Ratio
100MHz 400MHz 17x
100MHz 400MHz 18x
Note: Since the latest processor,
Northwood, would detect the
and clock ratio automatically, you
may not be able to adjust the
clock ratio in BIOS manually.