Asus P5KR Manual page 88

Some of the following items appear when you set AI Overclocking to [Manual]
or [N.O.S.]. The items vary depending on which option you select.
N.O.S. Mode [Auto]
Allows you to set the Non-delay Overclocking System mode.
Configuration options: [Auto] [Standard] [Sensitive] [Heavy Load]
CPU Ratio Control [Auto]
Configuration options: [Auto] [Manual]
The following item appears when the CPU Ratio Control item is set to
[Manual].
Ratio CMOS Setting [12]
Use the <+> and <-> keys to select the CMOS ratio values from 6 to 12.
FSB Strap to North Bridge [Auto]
When this item set to [Auto], FSB will be adjusted automatically by FSB frequency
and DRAM frequency. Configuration options: [Auto] [200MHz] [266MHz] [300MHz].
FSB/CPU External Frequency Synchronization
Front Side Bus
DRAM Frequency [Auto]
Allows you to set the DDR2 operating frequency.
Configuration options: [Auto] [DDR2-667MHz] [DDR2-800MHz] [DDR2-1066MHz]
Selecting a very high DRAM frequency may cause the system to become
unstable! If this happens, revert to the default setting.
DRAM Command Rate [Auto]
Configuration options: [Auto] [1T] [2T]
DRAM Timing Control [Auto]
Allows you to set the DRAM timing control. Configuration options: [Auto] [MANUAL]
The following items appear when you set the DRAM Timing Control item to
[Manual].
4-18
CPU External Frequency
FSB 1333
FSB 1066
FSB 800
333 MHz
266 MHz
200 MHz
Chapter 4: BIOS setup