Abit BE7, User Manual

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3-4 Chapter 3
User Define:
WARNING:
The wrong settings of the multiplier and external clock in certain circumstances may cause
CPU damage. Setting the working frequency higher than the PCI chipset or processor specs, may cause
abnormal memory module functioning, system hangs, hard disk drive data lose, abnormal functioning of
the VGA card, or abnormal functioning with other add-on cards. Using non-specification settings for your
CPU is not the intention of this explanation. These should be used for engineering testing, not for normal
applications.
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.
BE7 Series