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Chapter 4: BIOS
Snoop Filter
Select Enabled to eliminate snoop traffi c to the graphics port to greatly improve
system performance when running graphics intensive applications. The options are
Enabled and Disabled.
Crystal Beach Features
Select Enabled to use the Intel I/O AT (Acceleration Technology) to accelerate
the performance of TOE devices. (Note: A TOE device is a specialized, dedicated
processor that is installed on an add-on card or a network card to handle some or all
packet processing of this add-on card. For this motherboard, the TOE device is built
inside the ESB 2 South Bridge chip.) The options are Enabled and Disabled.
HD (High Defi nition) Audio Controller
This option allows the user to enable or disable the onboard HD Audio Controller.
Select Auto to allow the HD Audio Controller to be automatically enabled when
detected by the BIOS. The options are Enable, Disabled and Auto.
Route Port 80h Cycles to
This feature allows the user to decide which bus to send debug information to. The
options are Disabled, PCI and LPC.
Clock Spectrum Feature
If Enabled, the BIOS will monitor the level of Electromagnetic Interference caused
by the components and will attempt to decrease the interference whenever needed.
The options are Enabled and Disabled.
High Precision Event Time
Select Yes to activate the High Precision Event Timer (HPET), which is capable of
producing periodic interrupts at a much higher frequency than a Real-time Clock
(RTC) can in synchronizing multimedia streams, providing smooth playback and
reducing the dependency on other timestamp calculation devices, such as an x86
RDTSC Instruction embedded in a CPU. The High Precision Event Timer is used
to replace the 8254 Programmable Interval Timer. The options for this feature are
Yes and No.
USB Function
Select Enabled to enable the function of USB devices specifi ed. The settings are
Enabled and Disabled.
Legacy USB Support
This setting allows you to enable support for Legacy USB devices. The settings
are Enabled and Disabled.
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