Asus P5VDC-X - Manual (Page 64)

2-18 Chapter 2: 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 400. Refer to the table below for the correct Front
Side Bus and CPU External Frequency settings.
AGP/PCI Frequency [Auto]
Sets the AGP/PCI frequency. Configuration options: [Auto]
[66.6/33.3] [75.0/37.5] [88.0/44.0]
PCIE Frequency [Sync]
Allows you to select the PCIE frequency mode.
Configuration options: [Sync] [Async]