Operating modes

Description

Select the operating mode based on your preference. The efficiency of power saving and the system performance are highly dependent on your hardware and software environment.

• Custom Mode: select this mode if you are going to configure the following items:

  • Memory speed

  • Memory Power Management

  • CPU P-state control

  • Turbo mode

  • Energy Efficient Turbo

  • C-States

  • Power/Performance Bias

  • Platform Controlled Type

  • MONITOR/MWAIT

Select your desired memory speed.

• Minimal power mode: maximizes power savings.

• Balanced mode: offers a balance between performance and power efficiency.

• Maximum performance: maximizes the performance.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

• Automatic: suitable for most applications.

• Disabled: provides maximum performance but minimum power savings.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

Select the method to control CPU P-states (performance states).

• None: disables all P-states and the CPUs run at either their rated frequency or in turbo mode (if turbo is enabled).

• Legacy: the CPU P-states will be presented to the operating system (OS) and the OS power management (OSPM) will directly control which P-state is selected.

• Autonomous: the P-states are controlled fully by system hardware. No P-state support is required in the OS or VM.

• Cooperative: a combination of Legacy and Autonomous. The P-states are still controlled in hardware but the OS can provide hints to the hardware for P-state limits and the desired setting.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

Enabling turbo mode can boost the overall CPU performance when all CPU cores are not being fully utilized. A CPU core can run above its rated frequency for a short period of time when it is in turbo mode.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

When energy efficient turbo is enabled, the CPU’s optimal turbo frequency will be tuned dynamically based on CPU utilization. This item is also related to the setting of Power/Performance Bias.

C-states reduce CPU idle power.

• Legacy: When it is selected, the operating system initiates the C-state transitions. For E5/E7 CPUs, ACPI C1/C2/C3 map to Intel C1/C3/C6. For 6500/7500 CPUs, ACPI C1/C3 map to Intel C1/C3 (ACPI C2 is not available). Some OS SW may defeat the ACPI mapping (e.g. intel_idle driver).

• Autonomous: When it is selected, HALT and C1 request get converted to C6 requests in hardware.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

Power/Performance bias determines how aggressively the CPU will be power managed and placed into turbo.

• Platform Controlled: the system controls the setting. Platform Controlled is the default setting.

• OS Controlled: allows the operating system to control it. Not all OSes support this feature.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

• Maximum Performance: allows the most aggressive use of turbo and power management functions are disabled, thereby increasing power consumption.

• Efficiency - Favor Performance: the default setting.

• Minimal Power: disables turbo and maximizes the use of power management features.

When a preset mode is selected, the low-level setting are not changeable and will be grayed out. To change the settings, select Choose Operating Mode > Custom Mode.

Enable/Disable ADDDC Sparing.

This setting is disabled and grayed out when Page Policy is Adaptive.

Enabling ADDDC may cause reduced reliability of memory error correction in virtual lockstep under rare conditions.