Asus P5K/EPU manual CPU Ratio Control Auto, FSB Strap to North Bridge Auto, FSB Frequency

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	CPU External Frequency
FSB 1066	266 MHz
FSB 800	200 MHz

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]

•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.

ASUS P5K/EPU 4-17