User's Manual

6-7
Chapter 6: BIOS
Table 6-3. CPU and Clock Configuration Sub-menu
Menu Option Description
Ratio CMOS Setting
Sets the ratio between CPU core clock and the FSB frequency. The default
setting depends upon the type of CPU installed on the mainboard. The default
setting for the CPU installed in your mainboard is 18. Press + or - on your
keyboard to change this value.
NOTE: If an invalid ratio is entered, the AMI BIOS will restore the setting to a
previous state.
Hardware Prefetcher
If set to Enabled, the hardware prefetcher will prefetch streams of data and
instructions from the main memory to the L2 cache in the forward or backward
manner to improve CPU performance. Options are Enabled and D
ISABLED.
For UP platforms leave it enabled. for DP/MP servers, this setting may be used
to tune performance to the specific application.
Adjacent Cache Line
Prefetch
The CPU fetches the cache line for 64-bytes if this option is set to D
ISABLED. The
CPU fetches both cache lines for 128-bytes as comprised if Enabled.
For UP platforms leave it enabled. for DP/MP servers, this setting may be used
to tune performance to the specific application.
Max CPUID Value
Limit
This setting is Disabled for Windows systems.
Intel® Virtualization
Tech
Select Enabled to use this Virtualization Technology feature to allow one platform
to run multiple operating systems and applications in independent partitions,
creating multiple “virtual” systems in one physical computer system. The options
are Enabled and D
ISABLED. Please refer to the Intel website for further detailed
information.
NOTE: A full reset of the system is required when you change this setting.
Execute-Disable Bit
Capability
The Execute Disable Bit allows the processor to designate areas in the system
memory where an application code can be executed, and where it cannot. This
prevents a worm or virus from flooding illegal codes into the system to
overwhelm the processor or damage the system during an attack. The default
setting is Enabled.
Please refer to the Intel and Microsoft websites for more information.
Intel HT Technology
When this setting is D
ISABLED, only one thread per enabled core is enabled. The
default for this setting is Enabled.
Active Processor
Cores
Sets the number of cores to enable in each processor package. Default is ALL.
Table 6-4. IDE Configuration Menu
Menu Option Description
SATA#1
Configuration
If Compatible is selected, this sets SATA#1 to legacy compatibility mode.
Selecting Enhanced sets SATA#1 to native SATA mode. The options are
D
ISABLED, Compatible and ENHANCED.
Configure SATA#1 as
This setting allows you to select the drive type for SATA#1. The options are IDE,
RAID and AHCI. Choosing the RAID or AHCI changes which further menu
options appear on the screen.
Max Ports on SATA#1
This setting allows you to specify the max ports for SATA#1 when RAID
configuration is selected for SATA#1 Configuration. The options are 4 P
ORTS or
6Ports.