Asus P5E3 Premium WiFi-APn, User Manual

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4-18 Chapter 4: BIOS setup
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 CPU frequency using the
numeric keypad. The values range from 200 to 800. Refer to the table below for
the correct Front Side Bus and CPU External Frequency settings.
PCIE Frequency [Auto]
Allows you to set the PCI Express frequency. Use the <+> and <-> keys to adjust
the PCIE frequency. The values range from 100 to 180.
FSB/CPU External Frequency Synchronization
Front Side Bus
FSB 1600 FSB 1333 FSB 1066 FSB 800
CPU External Frequency 400 MHz 333 MHz 266 MHz 200 MHz
4.4.5 DRAM Command Rate [Auto]
Set this item to [1N] to provide possibility to accelerate DRAM performance or [2N]
to enhance DRAM overclocking ability.
Configuration options: [Auto] [1N] [2N]
• The DRAM Frequency configuration options vary with the FSB Frequency
settings.
• When the DRAM Frequency item is set to [DDR3-*1600MHz*], [DDR3-
*1800MHz*] or [DDR3-*2000MHz*], the FSB Frequency and CPU Ratio
Setting items will be optimized automatically.
• Selecting a very high DRAM frequency may cause the system to become
unstable! If this happens, revert to the default setting.
• DDR3-667 help: DRAM frequency lower than 800 MHz may cause system
boot failure due to spec violation.
4.4.4 DRAM Frequency [Auto]
Allows you to set the DDR3 operating frequency.
Configuration options: [Auto] [DDR3-667MHz] [DDR3-800MHz] [DDR3-835MHz]
[DDR3-887MHz] [DDR3-1002MHz] [DDR3-1066MHz] [DDR3-1111MHz] [DDR3-
1333MHz] [DDR3-*1600MHz*] [DDR3-*1800MHz*] [DDR3-*2000MHz*]