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4-20 Chapter 4: BIOS setup
FSB/CPU External Frequency Synchronization
Front Side Bus CPU External Frequency
FSB 1066 266 MHz
FSB 800 200 MHz
FSB 533 133 MHz
The following item appears only when you set the AI Overclocking item
to [Manual].
CPU Frequency [XXX]
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 CPU frequency. You can also type the desired
CPU frequency using the numeric keypad. The values range from 100
to 450. Refer to the table below for the correct Front Side Bus and CPU
External Frequency settings.
PCI Express Frequency [Auto]
Allows you to set the PCI Express frequency. This item is set to [Auto] by
default. Conguration options: [Auto] [90] [91]...[150]
PCI Clock Synchronization Mode [Auto]
Allows you to synchronize the PCI frequency with the PCI Express or CPU
frequency. Conguration options: [To CPU] [33.33MHz] [Auto]
DRAM Frequency [Auto]
Allows you to set the DDR operating frequency. The available conguration
options vary depending on the Front Side Bus settings. Refer to the table
below for details.
Available DRAM frequency options in various FSB settings
FSB Configuration options
Auto DDR2- DDR2- DDR2- DDR2- DDR2- DDR2- DDR2-
400 533 600* 667 711* 800* 889*
FSB 1066 • • • • • •
FSB 800 • • • • • •
FSB 533 • • •
* Provided for overclocking purpose only.
Selecting a very high DRAM frequency may cause the system to become
unstable! If this happens, revert to the default setting.