Asus p4p800s User Manual page 55

If you are using an unlocked CPU, the item CPU Ratio appears under the AI
Overclock Tuner item. You may select your desired ratio from the available
options.
CPU Ratio [12]
This field sets the ratio between the CPU Core Clock and the Front Side Bus (FSB)
Frequency.
If an invalid ratio is set in CMOS, the actual and setpoint values may differ.
Performance Mode [Auto]
Allows enhanced system performance. Setting to [Turbo] may cause the system to
become unstable. If this happens, revert to the default setting [Auto]. Configuration
options: [Auto] [Standard] [Turbo]
When you set the AI Overclocking Tuner item to [Manual], the related
overclocking items appear.
Configure System Frequency/Voltage
AI Overclock Tuner
CPU External Frequency (MHz)
DRAM Frequency
AGP/PCI Frequency (MHz)
CPU VCore Voltage
DDR Reference Voltage
AGP VDDQ Voltage
Performance Mode
CPU External Frequency (MHz) [XXX]
Indicates the frequency sent by the clock generator to the system bus and PCI
bus. The bus frequency (external frequency) multiplied by the bus multiple equals
the CPU speed. The value of this item is auto-detected by BIOS and is not
manually configurable. The values range from 100 to 400. Refer to the following
table for the correct Front Side Bus and CPU External Frequency settings.
Table 2.4.1 FSB/CPU External Frequency Synchronization
Front Side Bus
FSB 800
FSB 533
FSB 400
ASUS P4P800S motherboard user guide
[Manual]
[100]
[Auto]
[Auto]
[Auto]
[Auto]
[Auto]
[Auto]
(value is auto-detected)
CPU External Frequency
200 MHz
133 MHz
100 MHz
Select Screen
Select Item
+- Change Option
F1 General Help
F10 Save and Exit
ESC Exit
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