Advanced menu
41
Processor and clock options
Table 44. Processor & Clock Options submenu
BIOS item Usage
CPU Ratio If set to Manual, this option enables you to set the ratio between the CPU Core Clock
and the FSB Frequency. The options are Auto and Manual.
Note: If an invalid ratio is entered, the AMI BIOS will restore the setting to the
previous state.
Ratio CMOS Setting
(available when CPU Ratio
is set to Manual)
Press “+” or “-” on your keyboard to set the ratio between the CPU Core clock and
the FSB Frequency. The default setting for the CPU installed in your motherboard is
[18].
Clock Spread Spectrum Select Enabled to use the Clock Spectrum feature, which allows the BIOS to attempt
to reduce the level of Electromagnetic Interference caused by the components
whenever needed. The options are Disabled and Enabled.
Hardware Prefetcher
(available when supported
by the CPU)
If set to Enabled, the hardware prefetcher prefetches streams of data and instructions
from the main memory to the L2 cache in a forward or backward direction to
improve CPU performance. The options are Disabled and Enabled.
Adjacent Cache Line
Prefetch
(available when supported
by the CPU)
The CPU fetches the cache line for 64 bytes if this option is set to Disabled. The CPU
fetches both cache lines for 128 bytes if Enabled.
Intel Virtualization
Technology
(available when supported
by the CPU)
Select Enabled to use the feature of Virtualization Technology to allow one platform
to run multiple operating systems and applications in independent partitions,
creating multiple virtual systems in one physical computer. The options are Enabled
and Disabled.
Note: If there is any change to this setting, you will need to power off and restart the
system for the change to take effect. Refer to Intel’s web site for detailed information.
Execute-Disable Bit
Capability
(available when supported
by the OS and the CPU)
Select Enabled to use Execute Disable Bit, which allows the processor to designate
areas in the system memory where an application code can execute and where it
cannot. This prevents a worm or virus from flooding illegal codes to overwhelm the
processor or damage the system during an attack. The default is Enabled. Refer to
Intel and Microsoft Web sites for more information.
Simultaneous Multi-
Threading
(available when supported
by the CPU)
Select Enabled to use the Simultaneous Multi-Threading Technology, which adds a
second thread to each core, often improving CPU performance. The options are
Disabled and Enabled.
Active Processor Cores Select Enabled to use a processor’s second core and beyond. The options are All, 1
and 2. Refer to Intel’s Web site for more information.
Intel EIST Technology EIST (Enhanced Intel SpeedStep Technology) allows the system to automatically
adjust processor voltage and core frequency in an effort to reduce power
consumption and heat dissipation. The options are Disabled and Enabled. Refer to
Intel’s Web site for detailed information.
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