Operating Modes
Item | Options | Description |
Choose Operating Mode |
| Select the operating mode based on your preference. Power savings and performance are highly dependent on hardware and software running on the system. Efficiency – Favor Performance is the default setting. |
Memory Speed |
| Select the desired memory speed mode. [Maximum performance] mode maximizes performance. [Balanced] mode offers a balance between performance and power. [Minimal power] mode maximizes power savings. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose [Custom Mode] for "Choose Operating Mode" in "Operating Modes" located under "System Setting" submenu. Max Performance is the default setting. |
Memory Power Management |
| [Disabled] provides maximum performance but minimum power savings. [Automatic] is suitable for most applications. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode >.Custom Mode. Disabled is the default setting. |
CPU P-state Control |
| 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 Mode" is enabled). [Legacy]: The CPU P-states will be presented to the 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] is a combination of [Legacy] and [Autonomous]. The P-states are still controlled by hardware but the OS can provide hints to the hardware for P-state limits, indicating the desired setting. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode. Autonomous is the default setting. |
C1 Enhanced Mode |
| [Enabled]: Save power by halting idle CPU cores. To use this feature, an OS that supports C1E state must be installed. Setting change takes effect after the next reboot. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose [Custom Mode] for "Choose Operating Mode" in "Operating Modes" and [Legacy]/[Disabled] in "C-States" located under "System Setting" submenu. C1E status is changeable only when "C-states" is not [Autonomous]. Enabled is the default setting. |
UPI Link Frequency |
| Select the desired CPU UPI link frequency. [Maximum Performance] mode maximizes performance. [Balanced] mode offers a balance between performance and power. [Minimal Power] mode maximizes power savings. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode >.Custom Mode. Max Performance is the default setting. Note The UPI function works only if two or more processors are installed. |
UPI Link Disable |
| Disabling one of the CPU UPI links can save power. To achieve the maximum performance, all UPI links should be enabled. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode. Enabled All Links is the default setting. Note The UPI function works only if two or more processors are installed. |
Turbo Mode |
| [Enabled] 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 settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode. Enabled is the default setting. |
Energy Efficient Turbo |
| [Enabled]: The CPU's optimal turbo frequency will be tuned dynamically based on CPU utilization. This item is also influenced by "Power/Performance Bias". When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose [Custom Mode] for "Choose Operating Mode" in "Operating Modes" and [Enabled] in "Turbo Mode" located under "System Setting" submenu. Enabled is the default setting. |
C-States |
| C-states reduce CPU idle power. [Legacy]: The OS initiates the C-state transitions. ACPI C1/C2/C3 map to Intel C1/C3/C6. [Autonomous]: HALT and C1 request get converted to C6 requests in hardware. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode >.Custom Mode. Autonomous is the default setting. |
Power/Performance Bias |
| Power/Performance Bias determines how aggressively the CPU will be power managed and placed into turbo. [Platform Controlled]: The system controls the setting. [OS Controlled] allows the OS to control it. Not all OSs support this feature. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode. Platform Controlled is the default setting. |
Platform Controlled Type |
| [Maximum Performance] allows the most aggressive use of turbo and power management functions are disabled, thereby increasing power consumption. [Minimal Power] disables turbo and maximizes the use of power management features. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode. Efficiency - Favor Performance is the default setting. |
ADDDC Sparing |
| Enable/Disable ADDDC Sparing. Additional note for CPX platform: This item is [Disabled] and grayed out when "Page Policy" is [Adaptive]. Note Displayed help messages vary with platforms. |
Page Policy |
| [Adaptive] improves the performance of applications with a highly localized memory access pattern; [Closed] benefits applications that access memory more randomly. Closed is the default setting. |
MONITOR/MWAIT |
| MONITOR/MWAIT instructions are used to engage C-states. Some OSs re-enable C-states even when they are disabled in setup. To prevent this, do the following:
Enabled is the default setting. |
UPI Power Management | N/A | Set the desired power management level for the CPU UPI interface. L1 saves the most power but has longer latency compared to L0p or Disabled. When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode. Note The UPI function works only if two or more processors are installed. |