ASUS P5B Deluxe 4-17
FSB/CPU External Frequency Synchronization
The following items appear only when you set the AI Tuning 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.
Available DRAM frequency options in various FSB settings
* 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.
DRAM Frequency [Auto]
Allows you to set the DDR operating frequency.
Conguration options:
Front Side Bus CPU External Frequency
FSB 1066 266 MHz
FSB 800 200 MHz
 FSB Congurationoptions
Auto DDR2- DDR2- DDR2- DDR2- DDR2-
533 667 800 889* 1067*
FSB 1066 • • • • • •
FSB 800 • • • •
PCI Express Frequency [Auto]
Allows you to set the PCI Express frequency. This item is set to �Auto� by default.
Conguration options: [Auto] [90] [91] ~ [149] [150]
PCI Clock Synchronization Mode [Auto]
Allows you to synchronize the PCI frequency with the PCI Express or CPU frequency.
Conguration options: [Auto] [33.33MHz]
Spread Spectrum [Auto]
Allows you to enable or disable the clock generator spread spectrum.
Conguration options: [Disabled] [Enabled] [Auto]
The DRAM Frequency item also appears when you set the AI Tuning item to �AI
NOS�.