Asus P5KEPU - Motherboard - ATX User Manual page 80

CPU Ratio Control [Auto]
Configuration options: [Auto] [Manual]
The following item appears when the CPU Ratio Control item is set to
[Manual].
Ratio CMOS Setting [9]
Sets the ratio between CPU Core Clock and the FSB Frequency.
Use the <+> and <-> keys to select the CMOS ratio values from 6 to 9.
FSB Strap to North Bridge [Auto]
FSB Strap will be adjusted automatically by FSB Frequency and DRAM Frequency.
Configuration options: [Auto] [200MHz] [266MHz] [333MHz].
The following two items only appear when you set the Ai Overclocking item to
[Manual].
FSB Frequency [333]
Displays the frequency sent by the clock generator to the system bus and PCI bus.
The value of this item is auto-detected by the BIOS. Use the <+> and <-> keys to
adjust the FSB frequency. You can also type the desired CPU frequency using the
numeric keypad. The values range from 200 to 800. Refer to the table below for
the correct Front Side Bus and CPU External Frequency settings.
FSB/CPU External Frequency Synchronization
Front Side Bus
FSB 1066
FSB 800
PCIE Frequency [Auto]
Allows you to set the PCI Express frequency.
Configuration options: [Auto] [100] [101] ~ [149] [150]
DRAM Frequency [Auto]
Allows you to set the DDR2 operating frequency.
Configuration options: [Auto] [DDR2-667MHz] [DDR2-800MHz] [DDR2-835MHz]
[DDR2-887MHz] [DDR2-1002MHz] [DDR2-1066MHz] [DDR2-1111MHz]
[DDR2-1335MHz]
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CPU External Frequency
266 MHz
200 MHz
Selecting a very high DRAM frequency may cause the system to become
unstable! If this happens, revert to the default setting.
The configuration options of the DRAM Frequency item may differ
according to the CPU and the DIMM(s) you install.
Chapter 4: BIOS setup