SUPER MICRO Computer X8ST3-F, X8STE Intel C-STATE Architecture, C1E Support, C-STATE Tech

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

4-8