SUPER MICRO Computer X8STE - Manual (Page 74)

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X8ST3-F/X8STE User’s Manual
Intel® C-STATE Architecture
C-State, a processor power management architecture developed by Intel, can
further reduce power consumption from the basic C1 (Halt State) state, which
blocks clock cycles to the CPU. C-State is an idle state, and instructions are not
processed by the CPU. A brief explanation of all the C-States are as follows:
C0 - Active. The CPU is processing instructions.
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 Specific. Leaves the initialized application processor in a
processor-specific low C-State. For Intel Core i7 processors, this is the lowest
C-State supported.
C1E Support
Select Enabled to use the "Enhanced Halt State" feature. C1E significantly reduces
the CPU's power consumption by reducing the CPU's clock cycle and voltage during
a "Halt State." The options are Disabled and
Enabled.
C-STATE Tech
If enabled, C-State is set by the system automatically to either C2, C3 or C4 state.
The options are Disabled and
Enabled.
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.
DCA Technology
This feature accelerates 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