Abit BG7E User Manual page 48

3-4
If you use non-specification settings for normal operation, your system may not be stable, and may affect
system reliability. Also, we do not guarantee the stability and compatibility for settings that are not within
specification, and any damage of any elements on the motherboard or peripherals, is not our
responsibility.
Ext. Clock (CPU/AGP/PCI):
After choosing the "CPU Operating Speed" option as "User Define", you can choose the external clock
frequency from 100MHz to 250 MHz. The best frequency is either 100MHz or 133MHz depending on the
CPU type and its speed. The default setting is 100MHz.
PCI Bus Frequency:
This item determines the PCI bus frequency. The options are: Ext. Clock/3, Ext. Clock/4, 44MHz (fixed),
37MHz (fixed), and 33MHz (fixed). The default setting is Ext. Clock/3.
Multiplier Factor:
The multiplier factors for this motherboard are: x8, x9, x10, x11, x12 ...... (These factors vary with the
different type and specification of the CPU installed)
NOTE: Some processors might have this multiplier factor locked, so there is no way to choose a higher
multiplier factor.
DRAM Ratio H/W Strap:
This item sets the external hardware reset strap assigned to MCH (Memory Controller Hub). The options
are: Low, High, and By CPU. The default setting is By CPU.
To set this option manually:
•
Select "Low" for CPU of 400MHz FSB frequency.
•
Select "High" for CPU of 533MHz FSB frequency.
DRAM Ratio (CPU:DRAM):
This item determines the frequency ratio between CPU and DRAM. The options are: 1:1 and 3:4 (under
Low "DRAM Ratio H/W Strap" settings), or 4:5 and 1:1 (under High "DRAM Ratio H/W Strap" settings).
The default setting is By SPD.
Solution in case of booting problem due to invalid clock setup:
Normally, if the CPU clock setup is wrong, you will not be able to boot. In this case, turn the system off
then on again. The CPU will automatically use its standard parameters to boot. You can then enter the
BIOS Setup again and set up the CPU clock. If you can't enter the BIOS setup, you must try turning the
system on a few times (3~4 times) or press <INSERT> when turning on, and the system will
automatically use its standard parameters to boot. You can then enter BIOS SETUP again and set up the
new parameters.
When you change your CPU:
This motherboard has been designed in such a way that you can turn the system on after having inserted a
CPU in the socket without having to configure any jumpers or DIP switches. If you change your CPU,
normally you just have to turn off the power supply, change the CPU and then set up the CPU parameters
™
through SoftMenu III. However, if the new CPU is slower than the old one (and is the same brand and
type), we offer you two methods to successfully complete the CPU change operation.
BG7E
Chapter 3