Asus P5E-VM DO FSB Frequency [xxx], PCIe Frequency [Auto], DRAM Frequency [Auto]

The following item appears only when the CPU Ratio Control item is set to [Manual].

Ratio CMOS Setting [7]

Sets the ratio between CPU Core Clock and the FSB Frequency.

FSB 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 FSB frequency. You can also type the desired FSB frequency using the numeric keypad. The values range from 200 to 800. Refer to the table below for the correct Front Side Bus.

FSB/CPU External Frequency Synchronization

Front Side Bus	CPU External Frequency
FSB 1333	333MHz
FSB 1066	266 MHz
FSB 800	200 MHz

PCIe Frequency [Auto]

Allows you to set the PCIe operating frequency.

Configuration options: [Auto] [100] [101] [102] [103] [104] ~ [150].

DRAM Frequency [Auto]

Allows you to set the DDR2 operating frequency.

Configuration options: [Auto] [DDR2-667MHz] [DDR2-800MHz] [DDR2-889MHz] [DDR2-1067MHz]

Available DRAM frequency options in various FSB settings

FSB				Configuration options
	Auto	DDR2-	DDR2-	DDR2- DDR2- DDR2-			DDR2- DDR2- DDR2-
		667	800	833*	889	1000*	1067*	1111*	1333*
FSB 1333	•	•	•	•		•	•	•	•
FSB 1066	•	•	•		•	•	•
FSB 800	•	•	•

* 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.

2-22 Chapter 2: BIOS setup