Abit SX7-533 User Manual page 29

Introducing the BIOS
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Estimated new CPU clock:
This item will show you the frequency that according settings from the item "CPU Front Side Bus
Frequency" and "CPU Multiplier factor".
CPU FSB/DRAM/AGP/PCI ratio:
Eight options are available: 3:3:2:1 ) 3:4:2:1 ) 3:5:2:1 ) 3:6:2:1 ) 4:3:2:1 ) 4:4:2:1 ) 4:5:2:1 )
4:6:2:1. The default setting is 3:3:2:1 or 4:3:2:1. This item lets you set the processor Front Side Bus,
DRAM, AGP and PCI clock ratio. It correlates with the processor FSB clock you set. Many of options are
available, you can choose the divider ratio you want. In this case (4:3:2:1), the DRAM clock will be the
processor FSB clock divided by 4 and times 3. AGP clock will be the processor FSB clock divided by 4
and times 2. The PCI clock will be the processor FSB clock divided by 4 and times 1.
Fixed DRAM/AGP/PCI frequency:
Six options are available: Disable ) Not Fixed/66/33 ) Not Fixed/75/37.5 ) 133/66/33 ) 133/75/37.5
) 133/88/44. The default setting is Disable. This item can set the fixed DRAM/AGP/PCI frequency ratio.
You can decide which settings are proper for you.
" New FSB/DRAM/AGP/PCI clock:
This item will show you the new FSB/DRAM/AGP/PCI clock frequency that according settings from
the item "Fixed DRAM/AGP/PCI frequency"
Normally, we do not recommend that you use the "User Define" option to setup processor speed and PCI
clock. This option is for setup of future processors whose specifications are still unknown. The
specifications of all present processors are included in the default settings. Unless you are very familiar
with all processor parameters, it is very easy to make mistakes when you define the external clock and the
multiplier factor by yourself.
Solution in case of booting problem due to invalid clock setup:
Normally, if the processor clock setup is wrong, you will not be able to boot. In this case, turn the system
off then on again. The processor will automatically use its standard parameters to boot. You can then
enter the BIOS Setup again and set up the processor 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" key 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 processor:
This motherboard has been designed in such a way that you can turn the system on after having inserted a
processor in the socket without having to configure any jumpers or DIP switches. But if you change your
processor, normally you just have to turn off the power supply, change the processor and then, set up the
processor parameters through SOFT MENU
one (and is same brand and type), we offer you two methods to successfully complete the processor
change.
Method 1: Setup up the processor for the lowest speed for its brand. Turn the power supply off and
change the processor. Then turn the system on again, and set up the processor parameters
through SOFT MENU
Method 2: Since you have to open the computer case when you change the processor, it could be a good
idea to use the CCMOS jumper to erase the parameters of the original processor and enter
BIOS Setup to set up processor parameters again.
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III. However, if the new processor is slower than the old
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III.
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User's Manual