User`s manual
4-8
X8SIL/X8SIL-F/X8SIL-V
C1 - Auto Halt. The core clock (CPU) is off. This is the most basic idle state.
Some CPUs support C1E (C1 Enhanced) for lower power consumption.
C2 - Stop Clock. Both the core clock (CPU) and bus clocks (I/O) are off.
C3 - Deep Sleep. The clock generator is off.
C4 - Deeper Deep Sleep. Reduced VCC (Voltage supply).
C6 - Cache Power Off. Power is turned off to all caches.
C7 - Processor Specic. Leaves the initialized application processor in a
processor-specic low C-State. For Intel Core i7 processors, this is the lowest
C-State supported.
C-State package limit setting
If set to Auto, the AMI BIOS will automatically set the limit on the C-State package register.
The options are Auto, C1, C3, C6 and C7.
C1 Auto Demotion
When enabled, the CPU will conditionally demote C3, C6 or C7 requests to C1 based on
un-core auto-demote information. The options are Disabled and Enabled.
C3 Auto Demotion
When enabled, the CPU will conditionally demote C6 or C7 requests to C3 based on un-core
auto-demote information. The options are Disabled and Enabled.
Advanced Chipset Control
The items included in the Advanced Settings submenu are listed below.
Memory Remap Feature
This feature when enabled, allows the remapping of overlapped PCI memory above
the total physical memory. The settings are Enabled and Disabled.
Intel VT-d
Select Enabled to enable Intel's Virtualization Technology support for Direct I/O VT-d
by reporting the I/O device assignments to VMM through the DMAR ACPI Tables.
This feature offers fully-protected I/O resource-sharing across the Intel platforms,
providing the user with greater reliability, security and availability in networking and
data-sharing. The settings are Enabled and Disabled.
Active State Power Management
Select Enabled to start Active-State Power Management for signal transactions
between L0 and L1 Links on the PCI Express Bus. This maximizes power-saving
and transaction speed. The options are Enabled and Disabled.