Asus P5LD2 CPU Frequency[XXX], DRAM Frequency[Auto], PCIExpressFrequency[Auto], PCIClock Synchronization Mode [Auto]

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.

FSB/CPU External Frequency Synchronization

Front Side Bus	CPU External Frequency
FSB 1066	266 MHz
FSB 800	200 MHz
FSB 533	133 MHz

DRAM Frequency [Auto]

Allows you to set the DDR operating frequency. The available configuration 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.

PCI Express Frequency [Auto]

Allows you to set the PCI Express frequency. This item is set to [Auto] by default. Configuration options: [Auto] [90]...[150]

PCI Clock Synchronization Mode [Auto]

Allows you to synchronize the PCI frequency with the PCI Express or CPU frequency. Configuration options: [To CPU] [33.33MHz] [Auto]

4-20 Chapter 4: BIOS setup