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ASUS P5K/EPU
4-17
CPU Ratio Control [Auto]
Conguration 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.
Conguration options: [Auto] [200MHz] [266MHz] [333MHz].
FSB/CPU External Frequency Synchronization
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.
Front Side Bus CPU External Frequency
FSB 1066 266 MHz
FSB 800 200 MHz
The following two items only appear when you set the Ai Overclocking item to
[Manual].
PCIE Frequency [Auto]
Allows you to set the PCI Express frequency.
Conguration options: [Auto] [100] [101] ~ [149] [150]
DRAM Frequency [Auto]
Allows you to set the DDR2 operating frequency.
Conguration options: [Auto] [DDR2-667MHz] [DDR2-800MHz] [DDR2-835MHz]
[DDR2-887MHz] [DDR2-1002MHz] [DDR2-1066MHz] [DDR2-1111MHz]
[DDR2-1335MHz]
• Selecting a very high DRAM frequency may cause the system to become
unstable! If this happens, revert to the default setting.
• The conguration options of the DRAM Frequency item may differ
according to the CPU and the DIMM(s) you install.